O2 Sensor Circuit (Bank 2, Sensor 3)
The P0162 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Circuit (Bank 2, Sensor 3). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $350 (parts and labor)
Test O2 sensor voltage (should fluctuate 0.1-0.9V). Do not replace a $150 sensor without confirming it is actually bad first.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Shows real-time O2 sensor readings on your phone. See if the sensor is lazy, stuck, or actually working before spending money.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Decreased fuel economy
- Possible failed emissions test
- Slight decrease in engine performance
Probable Causes (Ranked by Likelihood)
- Faulty O2 sensor (Bank 2, Sensor 3) Very High
- Damaged wiring or connector to sensor High
- Exhaust leak before sensor location Moderate
- PCM circuit fault Low
Step-by-Step Diagnostic Procedure
-
Read O2 sensor Bank 2 Sensor 3 voltage on scan tool. Should fluctuate between 0.1V and 0.9V at steady cruise.
-
Inspect wiring and connector for damage, heat exposure, or corrosion.
-
Check for exhaust leaks near the sensor mounting location.
-
Measure sensor heater circuit resistance (typically 2-15 ohms).
Frequently Asked Questions
Where is Bank 2 Sensor 3?
Sensor 3 is the third O2 sensor in the exhaust stream on Bank 2, typically located downstream of the second catalytic converter, common on trucks and large V8 engines.
Do all vehicles have a Sensor 3?
No, most vehicles have only Sensor 1 (upstream) and Sensor 2 (downstream). Sensor 3 is found on vehicles with dual catalytic converters per bank.
Is P0162 a smog test failure?
Yes, any O2 sensor code will cause an emissions test failure due to the illuminated Check Engine Light.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.