BMW Error Code P1345: How to Fix It

Q: Can I drive my BMW with a P1345 code?

You should not drive with this code as it indicates a cylinder 4 misfire that can damage your catalytic converter. Continued driving may result in expensive catalytic converter replacement and potential engine damage.

Q: What causes BMW P1345 cylinder 4 misfire?

Common causes include faulty spark plugs, bad ignition coils, clogged fuel injectors, vacuum leaks, low compression due to worn piston rings or valves, or timing chain issues. Carbon buildup on intake valves is also common in BMW engines.

Q: How much does it cost to fix BMW P1345?

Costs vary widely depending on the root cause. Simple fixes like spark plugs ($20-50) or ignition coils ($100-200) are affordable, while fuel injectors ($200-400) or internal engine problems ($2000+) are more expensive.

Q: Will P1345 cause my BMW to fail emissions testing?

Yes, a cylinder misfire will likely cause your BMW to fail emissions testing. The code must be resolved and the catalytic converter must not be damaged for the vehicle to pass inspection.

Q: Is P1345 the same on all BMW models?

Yes, P1345 specifically indicates cylinder 4 misfire across BMW models, but the underlying causes and repair procedures may vary depending on your specific engine type and model year.

Abstract

BMW error code P1345 indicates a cylinder 4 misfire that's severe enough to potentially damage your catalytic converter. This means cylinder 4 isn't firing properly, causing rough idling, poor acceleration, and potential engine damage if not addressed quickly.