P1198 AUDI Possible Causes
- Faulty O2 sensor
- O2 sensor wiring harness open or shorted
- Poor electrical connection in O2 sensor circuit
How to Fix P1198 AUDI Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light on (or Service Engine Soon warning light)
P1198 AUDI Meaning
Oxygen sensors (O2S) or heated oxygen sensors (HO2S) must reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches this temperature, the sooner the sensor will begin sending an accurate signal to the Engine Control Module (ECM).
To achieve the required temperature, a heating element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor’s heating element based on engine coolant temperature and engine load signals. The ECM controls the heater circuit by allowing current to flow to ground.
The ECM monitors the voltage signal received through the heater circuit and determines the circuit’s status by comparing the detected voltage to factory specifications.