What Does P20E3 Mean?
The PCM has detected an implausible temperature difference between exhaust gas temperature sensors 1 and 3 on Bank 1. The temperature relationship between these sensors does not match expected values based on exhaust system operation.
Common Causes
40%
Failed EGT sensor (sensor 1 or 3) providing inaccurate readings
25%
Carbon deposits or soot buildup on sensor element
20%
DPF malfunction or excessive restriction affecting temperature gradient
10%
Exhaust leak between sensor 1 and 3 locations
5%
Sensor wiring damage or connector corrosion
Diagnostic Steps
1
Step 1: Monitor live data from EGT sensors 1 and 3 during cold start, idle, acceleration, and regeneration cycles
2
Step 2: Verify both sensors read ambient temperature when engine is cold (within 10-15°F of each other)
3
Step 3: Inspect sensors for carbon contamination, physical damage, or improper installation depth
4
Step 4: Check DPF differential pressure to determine if excessive restriction is affecting temperature readings
5
Step 5: Perform resistance test on both sensors and compare to temperature-resistance chart specifications
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The PCM has detected an implausible temperature difference between exhaust gas temperature sensors 1 and 3 on Bank 1. The temperature relationship between these sensors does not match expected values based on exhaust system operation.
The most common cause of P20E3 (Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1) is: Failed EGT sensor (sensor 1 or 3) providing inaccurate readings
Typical repair costs for P20E3 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but regeneration strategy may be compromised. Prolonged operation can lead to DPF plugging and potential engine damage from excessive backpressure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20E3 to identify the root cause.
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Quick Info
Category
Powertrain
System
Exhaust Aftertreatment System
Difficulty
Type
Generic (SAE)
Recommended Tools
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