View Full Version : code p172 and p175, before was p171 and p174

10-14-12, 08:35 PM
Hi, I got a mystery here, 01 catera, probably got scammed buying it.
Took to reputable shop several times, in the beginning was p411, fixed that with new ecu/ecm, then p172 and p172 came up, become hard to start in morning or after idle for more than a day but runs smooth, changed MAF, now the car idles bad and has p172 and p175 (changed MAF again, same).

Verified all connections and harness everything seemed alright.

What else could be wrong? could it be actual engine components?

10-26-12, 11:26 PM
I have the same, but with 100, 101 and 154. My attempt will involve first attempting to clean my MAF connectors and replacing my bank 2 no.1 O2 sensor. Then I will check all vacuum hoses I moved when replacing my cam cover gaskets. Any other suggestions? How are you progressing?

10-27-12, 08:55 PM
changed MAF three times, not the reason.
the car apparently was attempted to fix before.
the entire air system has been changed, the engine just struggles to breath air, only once warm up it runs great.
even the main ecm has been changed, do not see any leaks.
no one said anything and o2 so far.
it has 61k now.