P0137Severity: Low
P0137 – Oxygen Sensor Low Voltage (Bank 1 Sensor 2)
The downstream (post-catalyst) O2 sensor shows low voltage.
What it means
The post-catalyst oxygen sensor reports persistently low voltage (lean). A sensor fault, exhaust leak or wiring issue can be the cause.
Symptoms
- Check-engine light
- Emissions monitoring issues
- No obvious driving effect
Common causes
- Faulty downstream O2 sensor
- Exhaust leak
- Open wiring
- Sensor contamination
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Frequently asked questions
What does trouble code P0137 mean?
P0137 – Oxygen Sensor Low Voltage (Bank 1 Sensor 2). The post-catalyst oxygen sensor reports persistently low voltage (lean). A sensor fault, exhaust leak or wiring issue can be the cause.
Can I drive with a P0137 code?
It's usually not urgent, but finding and fixing the cause matters for emissions and fuel economy.