What would cause a code PO172 engine code on a 2006 Toyota Corolla CE model? On January29/11 the ecu and intake manifold gasket were replaced by the Toyota dealership.At the same time the maf sensor was replaced with an aftermarket one(BeckArnley).
Country: CanadaMake: ToyotaModel: Corolla CEYear: 2006Engine: 1.8L-1ZZ-FE
When i pulled out one of the sparkplugs it was coated with black carbon soot.Also, the air filter was dirty. Would i have to replace the front oxygen sensor before the catalytic converter?
Hello! Welcome to justanswer!
Ok, replace the plugs and the air filter. If the 172 comes back, it would be a problem with the Airflow Sensor. I'm pretty sure Beck Arnley has a year or more warranty so you shouldn't have to pay again for that part.
Don't you think the ports for the oxygen sensor would be plugged up since the sparkplugs were black and sooty (running rich)?
No, that would have a different code. You are dealing with a defective airflow sensor and dirty plugs.
ASE Master Automobile Technician with over 20 years exp. in this field.
Thanks for your excellent answers.
YOu are very welcome and thanks for responding to me as well. Have a happy 4TH!!!
Hi Anthony, Just a reminder, i have already 'ACCEPTED' your answer on July 4th @ 3.25pm est when you wished me 'Hava a happy 4th'.
I thank you again!
You are quite welcome.