What Does P20E2 Mean?
The PCM has detected an implausible temperature difference between exhaust gas temperature sensors 1 and 2 on Bank 1. These sensors should show expected temperature relationships based on exhaust flow and aftertreatment operation.
Common Causes
40%
Failed EGT sensor (sensor 1 or 2) reading incorrectly
25%
Carbon buildup or contamination on sensor element affecting response
20%
Exhaust leak between sensor locations affecting readings
10%
Wiring issues causing incorrect sensor reading
5%
DPF or catalytic converter malfunction affecting temperature profile
Diagnostic Steps
1
Step 1: Compare live data readings from both EGT sensors during various operating conditions and temperature ranges
2
Step 2: Inspect both EGT sensors for carbon buildup, physical damage, or contamination
3
Step 3: Check for exhaust leaks between the two sensor locations using smoke test or visual inspection
4
Step 4: Verify sensor resistances at ambient temperature match specifications for both sensors
5
Step 5: Monitor sensor response during DPF regeneration cycle to verify proper temperature rise patterns
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an implausible temperature difference between exhaust gas temperature sensors 1 and 2 on Bank 1. These sensors should show expected temperature relationships based on exhaust flow and aftertreatment operation.
The most common cause of P20E2 (Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1) is: Failed EGT sensor (sensor 1 or 2) reading incorrectly
Typical repair costs for P20E2 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven but DPF regeneration may not function properly. Continued operation may result in DPF damage or excessive backpressure causing engine damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20E2 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Exhaust Aftertreatment System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
