Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1
The P20E3 code indicates a correlation issue between exhaust gas temperature (EGT) sensor 1 and sensor 3 on bank 1. These sensors monitor exhaust temperature for diesel particulate filter (DPF) regeneration and emissions control. The PCM detects a signal mismatch, often due to sensor degradation, wiring faults, or exhaust leaks. This can lead to improper DPF regeneration, reduced fuel economy, and potential engine performance issues.
01. Most Common Causes
- Faulty EGT sensor 1 or 3
- Wiring or connector damage
- Exhaust gas leak near sensors
- PCM software or calibration error
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced fuel economy
- DPF regeneration issues
- Possible limp mode
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.
Step 3: Compare sensor readings using a scan tool at idle and under load.
Step 4: Check for exhaust leaks upstream of sensors.
Step 5: Test sensor resistance and voltage per manufacturer specs.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause DPF damage and reduced performance. Short trips may be okay, but have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees. Costs vary by vehicle and labor rates.