Replacement R9N 401 engine for the Nissan X-Trail 1.7L. Compare reconditioned, tested used and supply & fit options, with exact compatibility checked before your quote is progressed.
Engine code: R9N 401. Displacement: 1.7 litres, diesel, turbocharged. Family: R9N. Power: 148 hp (150 PS). Torque: 340 Nm (251 lb-ft). Fitted to: X-Trail. Production years: approximately 2018 onwards. Outputs vary by model year and calibration; the block stamp, checked against your registration, remains the match that matters.
| Property | Detail |
|---|---|
| Engine Code | R9N 401 |
| Displacement | 1.7L |
| Fuel Type | Diesel |
| Engine Family | M9R |
| Power | 148 hp |
| Fitted To | X-Trail |
| Known Faults | EGR and DPF build-up |
| Warranty | 6 to 12 months depending on option |
| Availability | Reconditioned and tested used engines |
Pick the buying route that suits your budget, timeline and the condition you want for your Nissan R9N 401 engine.
A strong option for buyers who want a balanced mix of reliability, renewed internals and long-term value.
A lower-cost buying route for customers who want a fast replacement and a more price-led solution.
Perfect if you want the engine supplied and the installation arranged through the workshop network in one quote path.
Use this table as a buying guide to see which Nissan models are commonly associated with the R9N 401 engine. Exact fitment is still confirmed before the order is finalised.
| Compatible Nissan Model | Years | Engine Size | Fuel Type | Model Page |
|---|---|---|---|---|
| X-Trail | 2019–2021 | 1700 cc | Diesel | View model |
Important: the compatibility table is a practical shopping aid. Always confirm the exact engine code, vehicle year and fitment before ordering.
The R9N carries the family’s copper-seal weakness into the present: combustion gas chuffs past a worn seal, a tick arrives under load, and carbon builds around the wells. Being a current engine changes the response, not the physics — the spill and balance tests place each seal precisely, and the stage they find decides between a reseal and a replacement with machined seats. Booked early, the cheap answer survives; the tests exist to catch it there.
The 1.7’s timing chain is quieter than its ancestors’ but no more patient: at higher miles a murmur arrives on cold starts, growing with the years if the oil discipline slips. The stretch check reads it directly, and because this engine is current, the measurement comes with a modern parts channel behind it. Early murmurs keep options open; ignored ones narrow them to a single, more expensive conversation.
Nissan engines matched by VRM to your exact code and variant
Reconditioned and tested used options with 6 to 12 months warranty
Compression, leak, history and mileage checks before any offer
Nationwide recovery and fitting available across the UK
Independent intermediary — vetted UK specialist workshops only
No fixed prices — bespoke written quotes per vehicle, no obligation
Every engine match is confirmed against your registration before any quote is issued, and all work is carried out by vetted third-party workshops operating as an independent comparison service.
An X-Trail’s real life often runs between school gates and supermarket carparks, and the DPF records every incomplete regeneration: soot loads, warnings stack, and limp mode arrives at the least convenient moment. Any replacement decision on an R9N reads the filter alongside the engine, because fresh rings behind a saturated DPF inherit the fault from day one. The specialists assess the emissions side while the bay is open and price it in the same visit.
On a car still in production the arithmetic leans towards acting: values hold, donors are recent, and a warrantied replacement protects an asset rather than nursing one. The tests price each fault on its own scale — seals, chain, filter — and the quote sets the repair total against a renewed engine on the same page. Owners decide once, with the whole picture, instead of twice with a breakdown between.
The current X-Trail’s bay is modern and the process is precise: plate lookup confirms the code, the stamp is verified at the bay, ancillaries transfer after inspection, and the road test includes a regeneration cycle plus a loaded run before sign-off. Most jobs complete within days, recovery is arranged where needed, and the warranty file slots into the car’s digital service story at handover.
Choose how you want your R9N 401 supplied: reconditioned to spec, a tested low-mileage used engine, or a complete supply & fit package with recovery.
⚙Stripped, measured, reconditioned to specification, pressure tested
◉Low-mileage original with compression and leak checks
⌁Matched engine, recovery, fitting and final check
No fixed prices are published — every quote is bespoke to your registration and chosen service.
| Option | What You Get | Warranty | Best For |
|---|---|---|---|
| Reconditioned | Stripped, measured, reconditioned to specification, pressure tested | 6 to 12 months | Long-term owners |
| Tested Used | Low-mileage original with compression and leak checks | 6 months | Budget buyers |
| Supply & Fit | Matched engine, recovery, fitting and final check | Up to 12 months on installation | Complete solutions |
The confusion is generational: the older R9M 402 and the current R9N 401 share outputs on paper and little else, and the parts books keep them strictly apart. The stamp settles it — on the block, mirrored in the V5C — and the registration lookup reads it from your plate in seconds. On a current car the double check matters twice over, because ordering against the wrong generation wastes both time and the warranty’s clean start.
Being the range’s newest diesel pays the owner three ways: the parts channel is live, so dates hold; donor histories are digital, so verification is fast; and the car’s remaining value argues for decisive action rather than patient nursing. The assessment counts all three into the quote – and on a current X-Trail the arithmetic usually lands on one side early. The tests still run first; the advantage simply makes the decision easier once they have.
Fitting a R9N 401 engine means clearing the emissions side before installation so the SUV is not immediately restricted again. The network workshops handle the changeover, and every installation is warranty-backed.
The chuff’s stage decides everything: seals caught in their first season are a reseal conversation with years of life either side; wells eroded past the machining line turn the same symptom into a replacement argument. The spill, balance and scope readings place your engine on that line in millimetres, and the quote reflects the placement rather than a menu. Current-engine owners have the best odds in this guide of catching it early – the tests make sure the odds are used.
Enter your registration to verify the R9N 401 code and compare reconditioned, tested used and supply-and-fit quotes from vetted UK specialists.
nissanfittedengines.co.uk operates as an independent comparison intermediary matching vehicle owners with vetted UK specialist workshops. No pricing is shown online; the matched workshop confirms the exact cost for your registration and requirements, with no obligation.
One lookup, three routes, one warranty-backed decision – start with your registration.
