M57N Injector Problems – Symptoms, Causes & Fixes

Engine: M57N 1 compatible injectors From £245

Common Injector Failures on the M57N

The M57N engine uses high-pressure common rail diesel injection. Over time, injector nozzles wear, seals degrade, and internal components lose calibration. This leads to a range of drivability symptoms that worsen if left unaddressed. We stock 1 tested replacement injectors for this engine from Bosch.

Vehicles fitted with the M57N include models from BMW. If you are experiencing any of the symptoms below, your injectors may need testing or replacement.

Symptoms of Injector Failure

Related Fault Codes

P0201 P0202 P0203 P0204 P0263 P0266 P0269 P0087 P0089 P0300

How to Test M57N Injectors

Leak-off test: Connect clear hoses to the injector return lines and compare fuel volumes at idle. The injector returning the most fuel is likely worn.

Correction values: Use a scan tool to read injector correction (IMA) values. Readings beyond ±3 mg/stroke indicate wear.

Resistance check: Measure resistance across the injector connector pins with a multimeter. Compare to manufacturer specs.

Complete Testing Guide Leak-Off Test Guide

M57N Injector Replacement Cost

Parts (per injector)

£245–£245

Labour

£150–£400

Total (per injector)

£395–£645

Full replacement cost guide

Compatible Injectors for the M57N1 found

13537808089Bosch

£245.00

Most Common Injector Part Numbers for M57N Engine

13537808089Bosch

£245.001 vehicle

Related Cross Reference Numbers for M57N

0445110131 0445115077 13537796042 13537808089

Vehicles Using the M57N Engine

Related Engine Codes

M57N2 M57TU M57TU2

Frequently Asked Questions

What are common injector problems on the M57N engine?

The M57N engine commonly suffers from injector seal failure, nozzle wear causing poor spray patterns, and back-leak issues. Symptoms include rough idle, black or white exhaust smoke, hard starting, and increased fuel consumption. These issues typically appear after 100,000–150,000 miles.

How much does it cost to replace injectors on a M57N engine?

A remanufactured injector for the M57N engine typically costs £245–£245 per injector. Labour adds £150–£400 depending on accessibility. We found 1 compatible injectors for this engine.

Which vehicles use the M57N engine?

The M57N engine is found in vehicles from BMW. Common models include BMW 3 Series, BMW 5 Series, BMW 7 Series, BMW X3, BMW X5.

How do I test the injectors on a M57N engine?

Perform a leak-off test by connecting clear hoses to each injector return line and comparing fuel volumes at idle. You can also check injector correction values with a diagnostic scan tool or measure electrical resistance with a multimeter.

Injector Compatibility Checker

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Need a Replacement M57N Injector?

We stock 1 tested replacement injectors for the M57N engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.

View All Injectors Replacement Cost Guide Call 020 3355 6581