Hi, I have a 2009 Toyota Corolla with 134,000 miles on it. It's been idling low. I've had the spark plugs changed, mass air flow sensor changed, new filter, body throttle and injectors cleaned. But it's still idling low. What do you think is the problem ?
I have the check engine light the code is P0171 which I researched and it could be long list of problems.
Check your engine air filter. Watch Scotty's video "how to fix a car that idles poorly" https://www.youtube.com/watch?v=yVLJABKj5vc&vl=en https://www.youtube.com/watch?v=NWCKvU2FmDc If the check engine light is on, go to a place like AutoZone and have the codes read for free. Does it only happen when you first start the car or only after it has warmed up? It may be a problem with an oxygen sensor or with the engine computer. If it was me, I would take the negative battery terminal off, and then clean the throttle body and wait half an hour, and then put the battery cable back on and go through the idle re-learn procedure.