Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2
The P2086 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the exhaust gas temperature (EGT) sensor located on Bank 2, Sensor 2 (downstream of the diesel particulate filter or catalytic converter). This sensor monitors exhaust temperature to protect components and optimize emissions. The code sets when the sensor signal is out of expected range or responds too slowly, often due to sensor degradation, wiring issues, or exhaust leaks.
1. Most Common Causes
- Faulty or degraded exhaust gas temperature (EGT) sensor
- Sensor wiring shorted, open, or with high resistance
- Corroded, loose, or poor ground electrical connection
- Mechanical exhaust system issue (e.g., exhaust leak altering temperature)
- Engine control module (ECM) failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible limp mode or reduced engine power
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and compare to manufacturer specs.
Step 4: Check for exhaust leaks upstream of the sensor.
Step 5: If all else fails, replace the sensor and clear codes.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause reduced performance, increased emissions, and potential damage to exhaust components. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY sensor replacement, or $150 to $300 if professionally diagnosed and repaired, including parts and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.