Heated oxygen sensor bank 1 sensor 2 lean exhaust indicated
What it means
P1137. Heated oxygen sensor bank 1 sensor 2 lean exhaust indicated. Downstream sensor reads lean. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Yukon with 4.8L, 5.3L V8 1999 to 2006..
Findings, check these first
- Exhaust leak ahead of sensor
- Faulty downstream oxygen sensor
- Vacuum leak causing lean mixture
- Low fuel pressure
- Sensor wiring fault
Standard procedure
- Inspect exhaust system for leaks
- Check for vacuum leaks
- Test fuel pressure
- Test sensor signal and wiring
- Replace bank 1 sensor 2 sensor if faulty
Look up another code
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Sources and review
Review: checked against the recorded source material.
- OBDII Code P1137 CHEVROLET - HO2S Bank 1 Sensor 2 Lean System or Low Voltage | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity and Chevrolet application
Fetched directly. HO2S bank 1 sensor 2 lean or low voltage matches the catalog downstream lean meaning. Model and year fitment remain curator claims.
Last updated 2026-09-25.
Report a correction for P1137. Include your vehicle, the issue and a source if you have one.
This fault is part of the Chevy P1xxx fuel and ignition codes guide. It covers the family and the order to check it.