PSA 4HH Engine Replacement: Why Your Boxer or Jumper 2.2 HDI Died and What It Costs
4HH engine dead? Boxer or Jumper 2.2 HDI failure explained - piston melt, DPF collapse, injector overload. Real replacement costs, what to order, what not to skip.
You searched for 4HH engine.
That means one of two things: you are replacing one, or you are about to. Either way, you are in the right place, and we are not going to waste your time.
This is the complete guide to the PSA 4HH 2.2 HDI engine - what it is, what it is fitted to, how it fails, what that failure costs to fix, and what a replacement actually costs when you include everything the first quote tends to leave out.
No forum rabbit holes. No parts-sellers who are vague about whether a 4HG will fit where your 4HH was. Just the information.
What Is the 4HH Engine?
The 4HH is the 96kW (130hp) variant of PSA's 2.2-litre DW12 diesel engine family. It is a 2,198cc, DOHC 16-valve four-cylinder diesel with common-rail direct injection and a variable-geometry turbocharger, built as part of the long-running Ford-PSA joint engine programme. Bore is 86mm, stroke is 94.6mm, compression ratio is 17.5:1, and it runs on five main bearings.
It powers the Peugeot Boxer, the Citroen Jumper, and the Citroen Relay (the same van, wearing a different badge for the UK and Irish markets). Some Fiat Ducato variants also received the 100hp version of this engine family under the 4HH umbrella designation, though Fiat generally preferred their own 2.3-litre Multijet unit for higher-output applications.
If your registration document or engine plate shows 4HH - or the alternative designation P22DTE - you have this engine. It is the same unit regardless of which badge is on the front of your van.
The family context matters: The 4HH shares its architecture with the 4HG (81kW/110hp) and 4HJ (110kW/150hp). They are not interchangeable. The power output difference is not just a remapped ECU - the variants have different fuel system calibrations and turbocharger specifications. A 4HH replacement must be a 4HH. Not "compatible with." Not "fits the same mounting points." A 4HH.
How the 4HH Kills Itself
This engine does not develop polite early warnings that resolve with a service visit. The failure modes are specific, interconnected, and final. Here are the three that account for the overwhelming majority of catastrophic 4HH engine deaths.
Failure Mode 1: Injector Over-fueling and Piston Destruction
This is the one that PSA's own documentation acknowledged.
The 4HH uses high-pressure Denso common-rail injectors operating at pressures that would make a reasonable person uncomfortable. When an injector wears - or is held open electronically by a contaminated or failing ECU command - it stops atomizing fuel. Instead of a precisely metered mist timed to combustion, it sprays a continuous stream of raw diesel directly onto the piston crown.
What happens next follows the laws of thermodynamics without exception. The piston crown overheats. PSA's pistons for this engine are slim-section units with limited material around the skirts - a design choice that makes the engine lighter and more efficient under normal conditions, and catastrophically vulnerable to concentrated heat under abnormal ones. The piston seizes, cracks, or burns through entirely.
When it burns through, pressurized combustion gases enter the crankcase. Engine oil is ejected violently through the dipstick or seals. The engine then fails simultaneously from thermal destruction and oil starvation. Two failure modes from one injector. No warning light that means anything actionable before the damage is complete.
PSA acknowledged early production Boxer and Jumper models - vehicles manufactured through late July 2008 - were particularly prone to this failure. The fuel pressure limiter valve (the component that is supposed to prevent the injector from staying open under overpressure) was identified as a contributing cause in early units. PSA implemented a partial warranty contribution scheme, though owners reported having to argue firmly to receive it.
The failure did not end with the 2008 production cut-off. Injector wear, ECU water ingress causing incorrect fueling commands, and fuel contamination continue to produce the same outcome in later 4HH units.
The warning signs that are easy to dismiss: Rough idle that gets worse in cold conditions, a knocking sound from one cylinder that stops when you lift off the throttle, hard starting after the van has sat overnight. Forum accounts of 4HH piston failure consistently describe a knocking phase that lasted days or weeks before the terminal event. Anyone experiencing these symptoms should have injectors pressure-tested immediately. A full injector set costs significantly less than an engine.
Failure Mode 2: DPF System Cascade and Turbocharger Destruction
The 4HH Euro 5 specification (fitted to 2011-2016 models) includes an active DPF regeneration system that is, to put it diplomatically, complex. It uses a "5th injector" - a fuel dosing pump and atomizer mounted directly on the exhaust - to spray fuel into the DPF at high temperatures, burning accumulated soot during regeneration cycles.
This system has multiple components that fail independently but whose failures compound each other:
The fuel atomizer nozzle clogs. It is a simple metal tube with no moving parts, but it sits on the exhaust pipe and accumulates carbon until fuel cannot pass through it. When it cannot deliver fuel, the DPF cannot regenerate. The DPF loads with soot. The engine enters limp mode.
The exhaust temperature sensors weaken or fail. When they do, they send incorrect temperature readings to the ECU. The ECU may initiate regeneration cycles at the wrong temperature - triggering excessive smoke when conditions are too cool for proper combustion of the diesel vapour, or triggering regeneration when the DPF is already at temperature and the additional heat is not needed. Either way, the DPF does not clean properly.
The EGR valve carbonizes. Vans operating short urban delivery routes - the exact duty cycle that describes most working Boxers and Jumpers - never reach sustained temperatures high enough for natural regeneration. The EGR system recirculates exhaust gases back through the intake under these conditions, depositing carbon progressively until flow is restricted. Restricted EGR increases thermal load on the entire exhaust system, which accelerates turbocharger wear.
When the turbocharger seals fail under this elevated thermal stress, engine oil enters the intake stream. The engine begins burning its own lubricating oil as supplementary fuel. This triggers diesel runaway - the engine accelerates uncontrollably, self-fueling on its own oil. The only intervention is blocking the air intake completely. The engine revs until it destroys itself internally if this does not happen fast enough.
The SID208 ECU unit (Continental) fitted to 2011-2016 4HH-equipped vehicles adds one more vulnerability to this chain. The unit is mounted low on the engine block with limited protection from moisture. Water ingress is a documented and common failure mode - the ECU malfunctions silently, producing fault codes that return immediately after clearing, fueling irregularities, and in severe cases complete non-starting. A failed SID208 can produce exactly the kind of injector command anomalies that initiate the piston damage described above.
Failure Mode 3: High-Pressure Fuel System Failure
The 4HH's common-rail fuel system relies on two critical components that fail independently but with related consequences: the SCV (Suction Control Valve) and the PRV (Pressure Relief Valve).
The SCV controls how much fuel the high-pressure pump draws from the low-pressure side. When it fails, it typically fails open - delivering maximum pump pressure to the fuel rail regardless of ECU demand. The PRV is the safety valve designed to protect the injectors and rail from this overpressure event.
When the SCV fails open and the PRV is compromised (or cannot respond fast enough), the fuel rail operates at extreme pressure. The injectors receive fuel at pressures far beyond specification. This creates over-fueling conditions in one or more cylinders - which is the starting point for piston failure described above.
Symptoms before catastrophic failure: rough idle, difficulty starting, loss of power under load, a persistent fuel pressure fault code after you have already replaced the high-pressure pump. If you are experiencing any of these and your mechanic has already replaced the pump without resolution, the SCV and PRV are the next logical investigation. Genuine Denso parts are non-negotiable for this repair - counterfeit SCV and PRV units are common in the market and fail the ECU's calibration process even when they physically fit.
Your Options and What Each One Actually Costs
There are four ways to resolve a dead 4HH. Here is each option with the number that actually appears on your bank statement, not the number on the workshop whiteboard.
Option A: PSA Dealer OEM Exchange
What they say: Factory specification, genuine warranty, peace of mind.
What you get: A genuine solution at a genuine price that is structured to make the alternatives look reasonable.
The cost: EUR 5,265 to EUR 7,020 for the exchange engine unit. Add EUR 720 to EUR 1,500 for independent garage labour (12-15 hours), or EUR 1,200 to EUR 2,100 at a main dealer. Total: EUR 5,985 to EUR 9,120.
The timing reality: OEM exchange engines run on PSA's distribution schedule. For a commercial vehicle generating revenue, the wait is not an operational answer.
Option B: Reconditioned Unit
What they say: Professionally rebuilt to OEM specification, warranted for 12 months.
What you get: An engine that someone has opened and rebuilt. The quality range is wide. Fair Motors Germany - one of Europe's largest engine traders - prices the 4HH reconditioned at EUR 2,759. Transit Tech and similar UK specialists operate at comparable levels. Others are doing the same job with older machinery and broader tolerances.
The cost: EUR 2,109 to EUR 4,009 for the unit. However: core exchange charges of EUR 250 to EUR 800 are standard, refundable only if your old engine is returned in a condition the supplier deems acceptable. If your engine failed from bearing seizure, your core is scrap metal. The deposit does not come back.
Warranty reality check: Read the exclusions before you order. Turbocharger damage is excluded across the board. "Overheating damage" is excluded everywhere. Given that the most common 4HH failure modes involve oil loss and overheating as sequential events, those exclusions cover exactly the scenarios you are most likely to encounter.
Total realistic cost: EUR 3,000 to EUR 5,800 depending on core situation, warranty terms, and which rebuild quality you land on.
Option C: Used Engine from a Breaker
What they say: Low mileage, tested, guaranteed.
What you get: An engine with a history that cannot be independently verified, from a vehicle written off for reasons the listing does not disclose. Vans used for commercial delivery accumulate mileage at three to four times the rate of passenger cars. A "60,000km" Jumper engine is operating history equivalent to a 200,000km passenger car engine.
The cost: EUR 500 to EUR 2,500 depending on claimed mileage. Thirty-day warranties. No coverage for accessories, sensors, or ancillary components.
Honest assessment: For a non-critical vehicle where downtime is acceptable and budget is the primary constraint, a well-sourced used engine from a reputable breaker with verifiable VIN history is not irrational. For any vehicle generating revenue, it is a gamble with your business continuity.
Option D: Factory-New Engine
What they say: Nothing. Factory-new engines do not need marketing language.
What you get: An engine that has never run. Zero hours. No previous failure events. No metal debris from a previous owner's oil pump failure circulating through the galleries waiting to destroy your bearings.
The cost: Majestic Engines supplies factory-new 4HH replacement engines at EUR 3,690 ex-VAT (EUR 4,539 inc-VAT). No core exchange. No deposit. No conditions on the condition of your old unit.
The comparison that matters: EUR 3,690 factory-new versus EUR 2,759 reconditioned average. The difference is EUR 931. The factory-new engine has never been run; the reconditioned unit has been disassembled, measured, and reassembled with replacement components - a process that is done well when it is done well, and done optimistically when it is not. EUR 931 is the price of that uncertainty.
Against the OEM dealer option (EUR 5,265 to EUR 7,020), the factory-new Majestic price is 30 to 47% lower. Same factory-new condition. Twelve-month warranty.
The Total Cost With Everything Included
The engine price is not the total cost. Here is the honest calculation:
| Line Item | Budget | Realistic |
|---|---|---|
| Engine (factory-new) | EUR 3,690 | EUR 3,690 |
| Labour (independent, 12-15hrs) | EUR 720 | EUR 900-1,200 |
| Turbocharger (if oil starvation failure) | EUR 400 | EUR 700-1,000 |
| Timing chain kit | EUR 200 | EUR 400-500 |
| Coolant | EUR 30 | EUR 60 |
| Engine mounts (if worn) | - | EUR 150-250 |
| Total | EUR 5,040 | EUR 5,900-7,600 |
Skipping the turbocharger if the engine died from oil starvation is not a saving. It is prepayment on your next engine replacement. Metal debris from bearing failure circulates through the oil system and lodges in the turbocharger, which operates at up to 200,000 revolutions per minute on oil pressure alone. A new engine fed by a contaminated turbocharger will fail within a few thousand kilometres. The turbo replacement is not optional.
What You Need to Know Before Ordering
Verify your exact engine code. The code is stamped on the engine block and appears on your vehicle registration document. 4HH designates the 96kW/130hp variant. If your vehicle has a 4HG (81kW) or 4HJ (110kW), those are different fuel system calibrations and ECU mappings. A 4HH replacement in a 4HG vehicle will not be coded correctly by default. Confirm the code, not just the displacement.
The 4HH shares a shortblock with the Ford Puma engines used in the Transit DRF and DRR families. This is the Ford-PSA engine partnership in physical form - the same shortblock assembly (OE: 1607126380 / 1608903680) covers 4HH, 4HG, and several Ford Duratorq codes for the Euro 5 FWD applications. If you are shopping shortblocks rather than complete engines, confirm the OE part number against your specific code before ordering.
Injector coding is mandatory after engine replacement. The 4HH ECU (SID208 or Bosch EDC17 depending on year) must learn the calibration code of any new or replacement injectors. The 16-digit calibration code is printed on the injector body. This requires diagnostic software - either Lexia 3 (PSA factory tool) or a compatible equivalent. A workshop that does not mention this step is a workshop that is going to give you a rough-running van and a follow-up appointment.
If your SID208 ECU has failed, address it before or alongside the engine replacement. Installing a new engine and feeding it ECU commands from a water-damaged control unit is an efficient way to destroy the new engine's injectors within a short period. ECU repair is available from several European specialists. Replacement with a new unit requires VIN coding by a PSA dealer or suitably equipped independent.
The Realistic Timeline for a Fleet Operator
A Boxer or Jumper off the road costs revenue every day. Not abstractly - concretely. A single commercial van generating EUR 400 to EUR 600 daily in delivery revenue, sitting in a workshop for two weeks while an OEM exchange engine navigates PSA's distribution network, has already lost EUR 4,000 to EUR 8,400 before the workshop invoice arrives.
Against that number, the EUR 931 difference between a reconditioned unit and a factory-new replacement is one day's lost revenue. The difference between a used engine gamble and a factory-new engine with a 12-month warranty is two days.
Fleet managers who have replaced 4HH engines before do not debate these numbers. The machine has to run. The margin between options is noise against the cost of continued downtime.
One Honest Summary
The 4HH is a competent engine running a complex emissions system designed for conditions that commercial van use actively works against. Urban delivery routes, constant load, deferred servicing intervals - these are not edge cases for the Boxer and Jumper. They are the job description.
The DPF system was designed assuming regular long motorway runs. Most 4HH-equipped vans do not have those. The injectors were designed assuming consistent, uncontaminated diesel and a healthy ECU. The SID208 was designed without adequate weatherproofing. The pistons were designed to be light and efficient, which they are - right up until a fueling anomaly concentrates heat on their crown.
None of this is a conspiracy. It is just a capable engine in a demanding application, with a handful of known weaknesses that become catastrophic without the maintenance margins commercial operations rarely have.
When the 4HH fails, it fails completely. The question is not whether the next one will be better maintained. The question is how quickly your van gets back on the road.
EUR 3,690 for a factory-new engine. Twelve-month warranty. No core charge.
That is the number. The van needs to move.
You have the engine code. You need the engine.
Order your factory-new PSA 4HH replacement at EUR 3,690 ex-VAT - no core exchange, no deposit, 12-month warranty.