BMW 4er-Reihe F32/F33/F36/F82/F83 420d Coupé, 190 PS, 8-speed automatic, all-wheel drive (2015–2017)

Research for this car

• Generation guide BMW 4 Series F32/F33/F36 (2013-2021): known problems and buying guide

  A usable buy with recall work on record. Avoid early N20 petrol cars with no chain work on record.

• Engine guide BMW B47 2.0 diesel (318d, 320d, 520d): problems, costs and what to check

  A solid diesel with a fire-risk recall, so check the recall work and turbo paperwork first.

• Gearbox guide ZF 8HP 8-speed automatic (BMW Steptronic): problems, costs and what to check

  A solid 8-speed when its fluid is changed on time. Buy with oil records and a clean scan, and avoid one that shudders or has run in limp mode.

Known issues for this car

Before you buy this car

From the generation guide

1. Drive at part throttle on a flat road and watch for judder. Check that all four tyres match and that the pressures are right. Ask for the oil change record. Bad result: judder that stays after the tyres are checked, or no oil record.
2. Lift the car and check the springs, shock absorbers and tie rod ends. Bad result: leaking shocks, worn tie rod ends, or knocks over bumps.
3. Ask for proof that the EGR cooler was replaced on a four-cylinder diesel built 2015 or 2016. Bad result: no proof. The B47 guide covers the rest.

From the engine guide

1. EGR recall (VIN check). Check the VIN for open BMW campaigns. Ask for proof that the EGR cooler was checked or replaced. Bad: an open EGR campaign, or no proof on a car built 2014-2020.
2. Turbocharger (test drive). Ask where the car was driven. Turbo damage is reported mostly on cars used in low outside temperatures, where moisture in the clean-air pipe can freeze. Ask for turbo invoices. Bad: a turbo job with no paperwork. No scanner needed.
3. Injectors (records). Ask for injector service records on any car above 150,000 km. Bad: no record at that mileage. No scanner needed.
4. DPF (scanner). On any car above 250,000 km, check for DPF cleaning or replacement records. Bad: no records. A scanner shows stored DPF fault codes.
5. EGR valve (records). Ask whether the EGR valve was cleaned or replaced. Bad: a car used mostly in heavy traffic with no record. No scanner needed.

From the gearbox guide

1. Read the gearbox fault memory with a BMW-capable scanner. Bad result: pressure or solenoid codes such as 4F84, 4F87, P189C or P0748, or a past limp mode.
2. Ask for fluid and filter invoices. Bad result: no fluid change by 80,000 to 120,000 km, or a change without an adaptation reset.
3. Drive the car from cold and select Drive and Reverse. Bad result: a hard 1-2 shift, or a delay of 1-3 seconds before the gear engages.
4. Drive 15 minutes in town, then under load. Bad result: jerky 2-3 shifts, flaring, slipping or a burnt smell.
5. Hold a steady light throttle at low speed. Bad result: a shudder or vibration, which points to the torque converter lock-up clutch.
6. Look under the car on a lift. Bad result: oil at the wiring connector on the case, on the plastic pan or on the cooler lines.

Running costs

ADAC figures for 15,000 km a year over 60 months

ADAC versions