P2085: Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2
The P2085 code indicates an intermittent fault in the exhaust gas temperature (EGT) sensor circuit for Bank 1, Sensor 2. This sensor monitors exhaust temperature to protect the catalytic converter and DPF. An intermittent signal can be caused by wiring issues, loose connections, or a failing sensor. The PCM detects a voltage or resistance fluctuation that is out of expected range.
01. Most Common Causes
- Faulty EGT sensor (Bank 1, Sensor 2)
- Damaged or corroded wiring/connector
- Loose or intermittent electrical connection
- Exhaust system leaks near sensor
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced fuel economy
- Possible limp mode or reduced engine power
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor wiring and connector for damage or corrosion.
Step 3: Check sensor resistance and compare to manufacturer specs.
Step 4: Perform a wiggle test on the wiring harness while monitoring sensor signal with a scan tool.
Step 5: Replace the sensor if intermittent signal is confirmed and wiring is intact.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause catalytic converter or DPF damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for DIY sensor replacement; shop labor may add $100-$200.