Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1
The P20E2 code indicates a correlation issue between Exhaust Gas Temperature (EGT) sensors 1 and 2 on Bank 1. These sensors monitor exhaust temperature before and after the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system. The powertrain control module (PCM) detects a signal mismatch, often due to sensor degradation, wiring faults, or exhaust leaks. This can lead to incorrect regeneration cycles and reduced emissions control.
01. Most Common Causes
- Faulty EGT sensor 1 or 2
- Wiring or connector issues (corrosion, damage)
- Exhaust gas leaks near sensors
- PCM software or calibration error
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible DPF regeneration issues
- Decreased engine performance
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect EGT sensors and wiring for damage or corrosion.
Step 3: Compare live data from both sensors; check for erratic readings or out-of-range values.
Step 4: Test sensor resistance and voltage per manufacturer specs.
Step 5: Inspect for exhaust leaks near sensor locations.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short distances, but prolonged driving may cause DPF clogging or reduced performance. Have it diagnosed soon.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for sensor replacement, plus diagnostic fees. Labor may add $100-$200.