03-30-2008, 06:01 PM
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Join Date: Jan 2006
Location: Lancaster, PA
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Originally Posted by laramarvin
I read a DTC P0301 on my Corolla 2005 (misfire on Cyl. 1), no other DTC found. I have already inspected/replaced for the following:
1) MAF is OK.
2) Have new O2 sensor
3) Injectors working properly (steady click on idle)
4) PCV valve and hose are ok
5) Replaced with proper spark plugs and gap (0.043")
My problem started with P0171 but after changing the O2 sensor this DTC dissapeared and P0131 showed up, however, my engine struggles on idle.
Please, can anybody help me out??
Do you have code P0131 or not?
When did the P0301 code show up? After you changed the plugs? What kind of plugs did you use? Did you check all of your connections with your coil packs? What did you clean your MAF with?
Check all wiring and connectors that lead to the cylinders, especially the coil packs.