Showing articles & questions for topic
P0491

Related articles

P0491 OBD-II Trouble Code: Secondary Air Injection System Insufficient Flow Bank 1

P0491 code means there is a problem on the side of the engine which contains cylinder #1 due to a bad air inlet, faulty wires, relay, pump, or fuse.

Related questions

Two mechanics have not been able to repair misfire.

Hi there. Check the intake for a possible vacuum leak around the cylinder 4. If there is no vacuum leak around the cylinder number 4, then there could be a burned valve. Check the compression on all of the cylinders...

Browse related topics

C15/C1500 Pickup

see more topics

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Browse automotive topics

see more topics

Browse by car makes