P1434
Diagnostic Module Tank Leakage System Fault
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)
Symptoms
- Check Engine light comes on
- Increased fuel consumption
- The smell of fuel in or around the car
- Problems starting the engine
- Unstable engine idling
Causes
- Leaking fuel tank or cap
- EVAP system valve defect
- Damaged or clogged EVAP system tubes
- Malfunction of the pressure sensor in the fuel system
- Problems with wiring or connections
How to Fix
- Check the tightness of the fuel tank cap
- Inspect EVAP system pipes and connections for leaks
- Check the operation of the EVAP system valve
- Diagnose the pressure sensor in the fuel system
- Check electrical connections and system wiring