Mazda Error Code P1137: How to Fix It

Q: Can I drive my Mazda with P1137 error code?

Yes, you can drive with P1137 as it's a low severity code, but you may experience reduced fuel economy and the vehicle may not pass emissions testing. Address the issue within a few weeks to prevent potential catalytic converter damage.

Q: How much does it cost to fix Mazda P1137 error code?

DIY repair typically costs $50-150 for a new downstream oxygen sensor plus diagnostic scanner rental. Professional repair costs range from $200-400 including parts and labor.

Q: What causes P1137 error code in Mazda vehicles?

P1137 is most commonly caused by a faulty downstream oxygen sensor, exhaust leaks after the catalytic converter, damaged sensor wiring, or contamination from oil or coolant leaks affecting sensor operation.

Q: Will P1137 code cause my Mazda to fail emissions test?

Yes, P1137 will likely cause your vehicle to fail emissions testing since it indicates the oxygen sensor monitoring system isn't functioning properly, which is required for emissions compliance.

Q: How do I know if my downstream oxygen sensor is bad?

Signs of a bad downstream oxygen sensor include P1137 code, poor fuel economy, failed emissions test, and sensor voltage readings that don't fluctuate between 0.1-0.9 volts when tested with a multimeter.

Abstract

Mazda error code P1137 indicates a problem with the downstream oxygen sensor (HO2S B1S2) running lean, meaning it's detecting insufficient fuel in the air-fuel mixture. This sensor monitors exhaust gases after the catalytic converter on bank 1, sensor 2. While not immediately dangerous, this code can affect fuel economy and emissions if left unaddressed.