P2251 is set when λ sensor virtual ground is open for more than 2.0 sec. This DTC is due to λ sensor virtual ground open or faulty component.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Signal monitoring | 1. Virtual ground open 2. Faulty Lambda Sensor Unit | |
Enable Conditions |
•
Engine running
•
Lambda sensor unit heating | ||
Threshold Value |
•
Virtual ground is open. | ||
Fail Safe | Fuel Cut |
•
NO | |
EGR Off |
•
NO | ||
Fuel Limit |
•
NO | ||
Check Lamp |
•
NO | ||
