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Old 01-26-2009, 11:45 AM   #1 (permalink)
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Unhappy Failed Inspection Help

Same old story it sounds like. My engine light came on and I took my 04 Verona to AutoZone and got it coded. It came back PO171 and PO174. When I took it into the mechanic -- it was due for inspection anyway -- it of course failed inspection. The mech replaced two vacuum hoses and put in a new battery, and it still won't pass inspection. Now, I'm out the $$ and the engine light is still on, and I'm looking at having to park the car due to the inspection being out and my being out of $$ for a another mech to "fix" it.

The "Not ready" on the failed inspection are: Comp Cmpnt, Evap, and 02 Sens.

Anyone have any advice? I've researched through a few of the threads here, but its all a little overwhelming. So, I'm sorry if this duplicates another thread.
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Old 01-30-2009, 11:06 PM   #2 (permalink)
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PO171 in my experience has always led back to an O2 sensor, and they have a nasty habit of going out. PO174 I'm not sure of but could be referring to another O2 sensor on another "bank". In other words, one or two O2 sensors before the catalytic converter and another one or two O2 sensors after the converter. I don't own a Verona but I am very familiar with the all annoying PO171 code. Again, you'll have either two sensors total or it will be four. Look at these first, they're always suspect.

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Old 01-30-2009, 11:19 PM   #3 (permalink)
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Clean the MAF as well. Make sure there are no intake leaks.
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Old 02-02-2009, 11:19 AM   #4 (permalink)
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Thanks Maddog

I took my car to a mechanic and he putit on his niftly diagnostic machine and ran several diagnostics which lead him to believe that it wasnt the O2 sensors at all, that it was the MAF that has gone bad. I took it home, and my father and and I have cleaned it with the MAF cleaner. I'm going to run it a few miles and take see if it won't clear the codes. If not, it looks like the new ones are about $250.
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Old 03-26-2009, 01:53 PM   #5 (permalink)
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Maddog -

I replaced the MAF and the check engine is still on and the codes won't clear. Is the mechanic taking me for a run around the block? I don't understand? He's a friend and I haven't paid him anything so I can't see him benefiting from telling me it was the MAF if it wasn't.

What now? Replace all the O2 sensors? The inspection went out in December and I'm buying my time until I get pulled over!
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Old 04-05-2009, 09:26 PM   #6 (permalink)
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Check programming level (dealership) and Map sensor as well. Also check for excess oil in the intake. Lean codes can be from a miss as well so look into the injecto coil harnes for wire insulation shrinkage and cracking. Also check plug condition.
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Old 04-07-2009, 09:37 AM   #7 (permalink)
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Krikett-

Sorry to hear about your problems. I know this is frustrating. I can't speak for your mechanic but in my own experience the O2 sensors have failed before the MAF sensor did. Not to say that it can't be the other way around. Anyway, if his diagnostic tool is a "higher end" tool it should be a bit more specific. In the case of O2 sensors a good diagnostic tool will tell you which "bank" and whether the sensor that is reporting problems is upstream or downstream. Meaning before the catalytic converter or after it. This information will lead you right to the bad sensor. Hope this helps. Again, I know the frustration that this leads to. Good luck my friend.
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