P04A9 OBD II Trouble Code Exhaust Pressure Control Valve B Position Sensor/Switch Circuit High
How to quickly diagnose, repair, and info on symptoms and causes of a P04A9 code that indicates a high voltage in the B exhaust pressure control valve position sensor circuit.
Symptoms of P04A9 OBD II Trouble Code
- Illuminated check engine light
- Increased emissions
- Poor engine performance
- Hard starting
Common Causes of P04A9 OBD II Trouble Code
- Faulty exhaust pressure control valve
- Wiring problems
- Faulty PCM
Severity of P04A9 OBD II Trouble Code
The severity of this code is moderate to severe. It's a good idea to address this code as soon as possible.