M57N2 Injector Problems – Symptoms, Causes & Fixes
Common Injector Failures on the M57N2
The M57N2 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 M57N2 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
How to Test M57N2 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.
M57N2 Injector Replacement Cost
Parts (per injector)
£245–£245
Labour
£150–£400
Total (per injector)
£395–£645
Compatible Injectors for the M57N21 found
Most Common Injector Part Numbers for M57N2 Engine
Related Cross Reference Numbers for M57N2
Vehicles Using the M57N2 Engine
Related Engine Codes
Frequently Asked Questions
What are common injector problems on the M57N2 engine?
How much does it cost to replace injectors on a M57N2 engine?
Which vehicles use the M57N2 engine?
How do I test the injectors on a M57N2 engine?
Injector Compatibility Checker
Need a Replacement M57N2 Injector?
We stock 1 tested replacement injectors for the M57N2 engine. All remanufactured, bench-tested, and supplied with a 12-month warranty.