1. Check the OBD-II Codes:
Start by connecting an OBD-II scanner (onboard diagnostics) to your car's diagnostic port to scan for any error codes stored in the vehicle's computer. These codes can provide insights into the specific problem causing the check engine light to illuminate.
2. Inspect Speed Sensor:
Since your speedometer is also having intermittent issues, it's possible that the problem is related to the speed sensor. Locate the speed sensor on your vehicle; it's usually near the transmission or wheels. Check the sensor for any damage, dirt, or loose connections. Clean the sensor if necessary and make sure it's securely fastened.
3. Check Wiring:
Inspect the wiring connections related to the speedometer and check engine light circuit. Look for any loose, damaged, or corroded wires that could be causing interruptions. Tighten any loose connections and repair or replace damaged wires.
4. Faulty Instrument Cluster:
In some cases, a malfunctioning instrument cluster can cause both the check engine light and speedometer issues. Check if the other instruments, such as fuel gauge and tachometer, are functioning properly. If multiple gauges are affected, further diagnosis may be required to determine if the instrument cluster needs repair or replacement.
5. Seek Professional Help:
If you are unable to identify or fix the issue on your own, it's recommended to consult with a qualified mechanic or take your car to a reputable automotive repair shop. They can diagnose the exact root cause of the problems and perform the necessary repairs.
