# BMW 3 Series 2012–2018 Pre-Purchase Checklist | CarCaseFile

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> Printable pre-purchase inspection checklist for the 2012–2018 BMW 3 Series: the generation-specific checks that separate a good one from someone else's problem.

Case file · BMW-3-SERIES-2012-2018 · Field document

# BMW 3 Series 2012–2018 · Pre-purchase checklist

Bring this to the inspection. Every check below is specific to this generation's documented failure modes, not generic used-car advice.

[← Full case file](https://carcasefile.com/vehicles/bmw-3-series-2012-2018/)

Check 01

On 2012–2015 320i/328i: get proof the timing chain, guides, and oil pump drive chain were replaced. No proof = listen for a whining/rattling chain on cold start and price a $1,800–$3,500 job into your offer.

Check 02

Run the VIN through BMW/NHTSA recall lookup. Check the water pump connector recall (24V-608) on N20/N26 cars and the EGR-cooler recall (18V-755) on the 328d.

Check 03

Cold start the car yourself. Rattle on startup, a rough idle, or a drivetrain malfunction message are walk-away signs on N20 cars.

Check 04

Inspect the engine from below for oil leaks. Oil filter housing and valve cover gaskets leak on nearly every high-mileage F30, and oil dripping onto the belt or wiring makes it worse.

Check 05

Check coolant level and look for dried pink/white residue around the plastic expansion tank, hoses, and water pump. The cooling system is plastic and age-brittle.

Check 06

On 335i/340i: look for boost leaks or a replaced charge pipe (aluminum aftermarket pipe = a plus; the factory plastic one cracks).

Check 07

Verify the ZF 8-speed shifts crisply and has a fluid-service record if over ~70k miles.

Check 08

Skip the ActiveHybrid 3 unless priced very cheap. Battery age and rarity make it a parts-availability headache.

Walk-away signals

2012–2014 320i/328i (N20/N26 timing chain guide failure) unless chain work is documented · Early-2015 328i built before the January 2015 chain redesign · Any 328d without the EGR-cooler recall completed

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