Possible causes – Intake leak– Damaged AIR system components– Faulty AIR Solenoid Valve– Faulty AIR system relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0491 Description The secondary air system detected that there was insufficient mass
Possible causes – Intake leak– Damaged AIR system components– Faulty AIR Solenoid Valve– Faulty AIR system relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Intake leak– Damaged AIR system components– Faulty AIR Solenoid Valve– Faulty AIR system relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Lean air/fuel ratio-Low fuel pressure– Failed HO2S11– Vacuum leak on engine– Failed MAF Sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Secondary air pump with no or low air flow– Secondary air bypass solenoid leaking /blocked or stuck open /closed– Secondary AIR air hose restricted– Secondary air vacuum hoses restricted or leaking Symptoms – Engine Light ON (or