P1199 (Volkswagen): Oxygen Sensor Heater Circuit Bank 2 Sensor 2 Electrical Malf… — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Oxygen Sensor Heater Circuit Bank 2 Sensor 2 Electrical Malfunction. Source catalogue definition; confirm applicability using vehicle service information.
Affected system: Powertrain
Symptoms
Check Engine light illuminated
Increased fuel consumption
Engine running in fail-safe mode
Failed emissions test
Possible causes
Faulty oxygen sensor heater element
Damaged or corroded sensor wiring harness
Blown fuse for the O2 sensor heater circuit
Poor electrical ground connection
Faulty engine control module
What to check
Inspect the O2 sensor wiring for visible damage or oxidation
Test the fuse related to the oxygen sensor heater circuit
Measure the resistance of the oxygen sensor heater element using a multimeter
Verify supply voltage at the sensor connector with the ignition ON
Check for continuity between the sensor connector and the engine control module