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06-19-2012, 09:46 PM | #1 | |
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o2 downstream problem
I had a surging problem when cold at 25-35 mph. replaced both o2 sensors with bosch. Problem went away. Now have check engine light. code says downstream o2. replaced o2 downstream with another bosch, same problem. I think the stock o2 was a denso. any suggestions? Thank you.
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06-20-2012, 10:55 AM | #2 | |
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Re: o2 downstream problem
Incoming Air -> MAF sensor -> Engine -> H02 sensor for a feedback signal.
Did you clean the MAF sensor with CRC MAF sensor cleaner? |
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06-20-2012, 11:25 AM | #3 | |
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Re: o2 downstream problem
Thank you!
I will clean it. Tim |
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06-20-2012, 09:16 PM | #4 | |
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Re: o2 downstream problem
I cleaned the MAF 35k ago. the car has 83k. After I put a new filter in, I will let you know if the light goes out. Does the orientation of the MAF matter?
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06-21-2012, 08:25 AM | #5 | |
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Re: o2 downstream problem
cleaning maf might remedy a lean code if the maf element was dirty or contaminated but a 02 code.........what code are you getting?what size engine?
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06-22-2012, 12:27 PM | #6 | |
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Re: o2 downstream problem
I cleaned the MAF and replaced the air filter for the engine. I haven't driven it, so I will let you know if the light goes out. I did not write down the failure code. When I go back to the mechanic I will ask him for it. I do have a leak at the throttle body. The engine size, 3.5
Thank you. Tim |
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06-22-2012, 08:16 PM | #7 | |
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Re: o2 downstream problem
you will need to replace throttle body gasket....this will cause a lean condition
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