GM P1133 Error Code: How to Fix It

Q: What causes GM P1133 error code?

P1133 is typically caused by a faulty upstream oxygen sensor, damaged wiring, exhaust leaks near the sensor, or contamination from oil or coolant burning in the engine.

Q: Can I drive with P1133 code?

You can drive short distances, but the engine may run poorly, use more fuel, and produce higher emissions. Get it diagnosed and repaired as soon as possible to prevent potential catalytic converter damage.

Q: How much does it cost to fix P1133?

DIY repair costs $50-150 for a new oxygen sensor plus tools. Professional repair typically ranges from $200-400 depending on labor rates and whether additional diagnosis is needed.

Q: How often should oxygen sensors be replaced?

Oxygen sensors typically last 60,000-90,000 miles. Replace them as part of regular maintenance or when they fail to prevent damage to the catalytic converter and maintain optimal fuel economy.

Q: Will P1133 cause my car to fail emissions testing?

Yes, P1133 will likely cause your vehicle to fail emissions testing since it affects the air-fuel mixture monitoring system that's critical for emissions control.

Abstract

GM error code P1133 indicates that the heated oxygen sensor (HO2S) in Bank 1 Sensor 1 is not switching properly between rich and lean fuel mixtures. This sensor monitors the air-fuel ratio and helps the engine control module optimize fuel delivery and emissions control.