What Does P20E5 Mean?
The PCM has detected an implausible temperature difference between exhaust gas temperature sensors 1 and 2 on Bank 2. This correlation fault indicates the sensors are not reading expected temperature relationships for Bank 2 exhaust flow.
Common Causes
40%
Failed EGT sensor on Bank 2 (sensor 1 or 2)
25%
Carbon deposits or exhaust contamination on sensor element
20%
Exhaust leak on Bank 2 between sensor locations
10%
Bank 2 catalytic converter or aftertreatment malfunction
5%
Wiring or connector problems affecting sensor circuit
Diagnostic Steps
1
Step 1: Monitor Bank 2 EGT sensor 1 and 2 readings in live data across various engine loads and temperatures
2
Step 2: Compare Bank 2 sensor readings to Bank 1 sensors to identify which sensor is out of range
3
Step 3: Verify sensors read ambient temperature when engine is cold (should be within specification of each other)
4
Step 4: Inspect Bank 2 exhaust system for leaks, especially between the two sensor locations
5
Step 5: Test sensor resistance values and compare to specifications; inspect sensors for physical damage or contamination
Estimated Repair Cost
$200 - $850
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 2. This correlation fault indicates the sensors are not reading expected temperature relationships for Bank 2 exhaust flow.
The most common cause of P20E5 (Exhaust Gas Temperature Sensor 1/2 Correlation Bank 2) is: Failed EGT sensor on Bank 2 (sensor 1 or 2)
Typical repair costs for P20E5 range from $200 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but Bank 2 exhaust aftertreatment monitoring is compromised. May affect regeneration control and long-term catalyst/DPF efficiency.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P20E5 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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