Network
generic / SAE
U011A
Lost Communication With Exhaust Gas Sensor Module A
ECU lost CAN communication with exhaust gas sensor module A (often integrates wide-range O2/NOx sensors).
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 1A
Possible causes
- Module unpowered high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 100–1200 €
- Estimated time: 1–4 h
- Component: exhaust gas sensor module a
- Component: can bus
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012