BMW Error Code P1420: How to Fix It

Q: What causes BMW P1420 error code?

P1420 is typically caused by a faulty secondary air injection valve, damaged wiring harness, blown fuse, bad relay, or rarely a failing engine control module. Corrosion in electrical connections is also a common cause.

Q: Can I drive with P1420 code?

Yes, you can drive with P1420 as it's a low-severity code that affects emissions but not engine operation. However, you should fix it promptly to pass emissions testing and prevent potential catalytic converter damage over time.

Q: How much does it cost to fix BMW P1420?

DIY repair costs range from $20-150 depending on the faulty component. A blown fuse costs under $5, while a new secondary air injection valve typically runs $80-150. Professional repair can cost $200-500 including labor.

Q: Will P1420 cause BMW to fail emissions test?

Yes, P1420 will likely cause your BMW to fail emissions testing since it indicates a problem with the secondary air injection system, which is part of the emissions control system.

Abstract

BMW error code P1420 indicates an electrical problem with the secondary air injection valve circuit. This system helps reduce emissions during cold starts by injecting fresh air into the exhaust system, and electrical faults can trigger the check engine light.