O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
The P0162 code indicates a malfunction in the oxygen sensor circuit for Bank 2, Sensor 3. This sensor is located downstream of the catalytic converter on the engine bank that does not contain cylinder #1. The powertrain control module (PCM) has detected an abnormal voltage or response time from the sensor, which can affect fuel trim and emissions monitoring.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2 Sensor 3)
- Wiring or connector issues (shorts, opens, corrosion)
- Exhaust leak near the sensor
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Failed emissions test
- Possible rough idle or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the O2 sensor wiring and connector for damage or corrosion.
Step 3: Use a multimeter to check sensor heater circuit resistance and voltage output.
Step 4: Check for exhaust leaks upstream of the sensor.
Step 5: If all else is good, replace the oxygen sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor fuel economy and eventually damage the catalytic converter. It's best to diagnose and fix promptly.
How much does it cost to fix?▼
Typically $50-$150 for the sensor plus labor if you don't DIY. Total cost can be $100-$300 at a shop.