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Just had dealrer replace 2 o2 sensors- codes were po171 and po174- worked OK for around 100 miles and then ck engine light back on but only with codes po174 now???
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Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem? If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.
PO 171--is an O2 Sensor Code for a Lean Condition
on Bank 1 (right side exhaust)
PO 174 -- is an O2 Sensor Codes for a Lean Condition
on Bank 2 (left side exhaust)
You gave us no vehicle
You gave us no drivability issues or
vehicle history,nothing
If the O2's have 100,000 miles on them,change the (2)
closest to the engine. They are most likely worn out
& the switching times are too slow to control injector
pulse width & thus set a MIL Lamp (OBD2 Fault ) on
your dash
You can learn a lot on the internet if you put OBD2 in your
Search Engine (Internet Explorer,etc)
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