Possible Causes
- GOOD TRIP EQUAL TO ZERO
- RESTRICTED FUEL SUPPLY LINE
- FUEL PUMP INLET STRAINER PLUGGED
- FUEL PUMP MODULE
- O2 SENSOR
- O2 SIGNAL CIRCUIT
- O2 RETURN CIRCUIT
- O2 SENSOR HEATER OPERATION
- THROTTLE POSITION SENSOR SWEEP
- MAP SENSOR OPERATION
- ECT SENSOR OPERATION
- ENGINE MECHANICAL PROBLEM
- FUEL CONTAMINATION/EXHAUST LEAK