Nissan QR25DE 2.5L Engine

The QR25DE is the 2.5-litre four-cylinder that Nissan put in almost everything — Altima, Rogue, Sentra, Frontier and X-Trail. It is a straightforward engine to live with, but it has one failure that is unlike anything else on the market, and it is the reason most people end up buying a replacement. This guide explains it properly.

The pre-cat failure that kills QR25DE engines

This is the one that matters, and it catches people out because it does not look like an engine fault at first.

On the QR25DE, the first catalytic converter is not under the car. It is bolted directly to the exhaust manifold, right against the cylinder head — a pre-catalytic converter. It runs extremely hot because it sits so close to the exhaust ports.

Over time the ceramic honeycomb inside it breaks apart. That debris has to go somewhere, and on valve overlap some of it gets drawn back into the cylinder through the open exhaust valve. Once abrasive ceramic grit is inside a running cylinder, it scores the bore and wrecks the piston rings.

What to check before you buy

• Look at the pre-cat, not just the engine. If a donor engine burned oil, ask whether the pre-cat was replaced. If it was not, the replacement will go the same way.
• Early units are the ones to watch. This shows up most on the original-generation engines, roughly 2002–2006 Altima and Sentra, where the ceramic substrate was least durable.
• Replace the pre-cat with the engine. Fitting a good used engine to a car with a failing pre-cat is the most expensive mistake you can make on this motor.
• Ask for a compression test. Scored bores show up as low compression on one or two cylinders. Every engine we list is compression tested before it goes on the shelf.

Used vs remanufactured QR25DE

Either way, the pre-cat decides the outcome. That is the difference between this engine and most others.

QR25DE specifications

Displacement	2,488 cc (2.5 L)
Bore × stroke	89 mm × 100 mm
Configuration	Inline four, DOHC, 16 valve, variable valve timing
Compression	9.5:1 to 10.5:1 original; 9.6:1 from the 2007 revision
Timing	Chain driven — no belt service interval
Balance shafts	Yes, counter-rotating
Output	152 hp in the Frontier, 170–182 hp in the Altima, up to 200 hp in the 2007–2012 Sentra SE-R Spec V

Original vs revised: the 2007 split

Nissan reworked the QR25DE for 2007. If you are matching an engine across model years, this is the line that matters.

• Original, 1999 to around 2006: dual-path aluminium intake manifold, cast steel connecting rods, original piston crown.
• Revised, 2007 onward: single-path resin intake manifold (California cars add a swirl control valve), new piston crown for 9.6:1 compression, balancer moved more central, revised camshaft profile, extra friction coatings, an additional top engine mount and a higher rev limit.

Reinforced connecting rods were fitted only to the 2007–2012 Sentra SE-R Spec V, not to ordinary QR25DE engines.

The QR family and its variants

• QR25DE — the port-injected 2.5 covered by this guide.
• QR25DD — direct injection, 10.5:1 compression, DLC-coated lifter buckets. Not interchangeable with the port-injected engine.
• QR25DER — supercharged hybrid unit with an electric motor and dual-clutch system. A different animal entirely.
• QR20DE — the 2.0-litre sibling, mostly outside the US market.

How to identify your QR25DE

On US-market Nissans the engine is identified by the 4th digit of the VIN. VIN A is the QR25DE. You will see this on our listings written as “VIN A, 4th digit”.

Two more things decide fitment:

• Build location. Some Rogues are Japan-built and some are not, and the two are not always the same part. Our listings state it where it applies.
• Emissions spec. Federal and California cars can differ, particularly on the intake side of the revised engine.

Not sure which you have? Text your VIN to +1 (361) 470-5276 and we will confirm the engine code, the build and what interchanges with it — free, no obligation.

Other known issues

Timing chain rattle

The QR25DE uses a chain, so there is no replacement interval, but the tensioner and guides wear. The signature is a rattle for a second or two on a cold start that then goes quiet. Left alone the chain can eventually skip a tooth, and on this engine that means valve damage. A cold-start rattle on a car you are inspecting is worth a conversation about price.

Oil consumption

Genuine ring and bore wear does happen on high-mileage units. But on a QR25DE, always rule out the pre-cat first — the two are usually the same story. Check the oil level on any engine you are buying and ask what the donor’s consumption was.

Which vehicles use the QR25DE

Vehicle	Years
Nissan Altima	2002–2018
Nissan Rogue	2008–2020
Nissan Sentra SE-R / SE-R Spec V	2002–2012
Nissan Frontier	2005–2019
Nissan Altima Hybrid	2007–2011
Nissan X-Trail	2001–2020
Suzuki Equator	2009–2012

Browse what we have in stock: used Nissan engines and used Nissan transmissions.

Which years to buy

• 2007 and later are the safer buy. The revised engine addressed several of the original’s weak points, and the pre-cat problem is less associated with these units.
• 2002–2006 can still be a good buy, but only with the pre-cat replaced and compression verified. Priced right, these are the bargains.
• Frontier units are rated lower at 152 hp and are tuned differently. Do not assume an Altima engine drops into a Frontier.

Used QR25DE prices

Our QR25DE engines start at $940, with most Altima and Rogue units landing between $940 and $1,600 depending on mileage. Lower-mileage units cost more, and the mileage on every listing is read off the donor odometer rather than estimated.

A remanufactured 2.5 typically runs two to three times that before labour.

What is included

Our QR25DE engines ship as tested assemblies. You transfer your own intake, sensors, accessories and flywheel or flexplate from the old engine. Each listing states exactly what is attached to that particular unit.

Budget for the pre-cat as part of the job. On this engine it is not an optional extra.

Shipping and warranty

Every engine is compression tested and photographed on the pallet before dispatch, so you approve it before it leaves. Preparation takes 3 to 5 business days, then 2 to 4 days in transit on insured freight. Shipping is free to any address in all 50 states, residential included.

Standard warranty is 6 months, extendable to 3 years. Returns within 7 days with free return shipping. Full terms: engine warranty policy · shipping policy · returns.

Frequently asked questions

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