* Mass Airflow Sensor (MAF) issue: A faulty MAF sensor provides inaccurate readings to the engine control module (ECM), affecting fuel mixture and potentially triggering both lights.
* Throttle Position Sensor (TPS) problem: A malfunctioning TPS sends incorrect information about throttle position, leading to poor engine performance and possibly disabling traction control.
* Oxygen Sensor (O2) malfunction: A bad O2 sensor can disrupt the air/fuel mixture, leading to poor engine performance and triggering the "Service Engine Soon" light. This could indirectly affect traction control systems which rely on engine performance.
* Wheel Speed Sensor (WSS) issue: Problems with a wheel speed sensor can cause the traction control system to malfunction, and might also set the "Service Engine Soon" light if the ECM detects a discrepancy in wheel speed data.
* Crank Position Sensor (CKP) or Cam Position Sensor (CMP) issue: These sensors are crucial for engine timing; a problem will negatively affect engine performance and is likely to trigger both lights.
* Low engine oil: While it's less likely to directly cause both lights, extremely low engine oil can cause enough of a problem to trigger the service engine soon light.
What you should do:
1. Get the codes read: The most important step is to have the diagnostic trouble codes (DTCs) read from your vehicle's onboard diagnostic system (OBD-II). An auto parts store often offers this service for free. The codes will give a much clearer indication of the problem.
2. Don't ignore it: Driving with these lights on could potentially damage your engine or cause further problems.
3. Professional diagnosis: Once you have the codes, take your Alero to a qualified mechanic or repair shop for diagnosis and repair. They can use the codes and further diagnostic tools to pinpoint the exact issue and fix it safely.
Attempting to diagnose and repair this yourself without the proper tools and knowledge is not recommended. The issue could be relatively simple or quite complex, and a proper diagnosis is essential for a safe and effective repair.
