Vehicle make/model = 2000 Olds Intrigue
Year = 2000
Mileage = 116000
Engine size = V6 (3.6L?)
dash lights = Check engine light
codes = PO137
work done prior = crank sensor replaced approx 20,000 mile previously
tech = JK
question = Code reader gives PO137, what do I check next?  I have been
warned not to jump to replace O2 sensor because it could be something
else.  I have the normal set of tools such and a DVM.






JK:
This code is for low voltage on 02 sensor #2, post catalytic converter.
Several things can cause this condition.
1- A bad sensor
2- lean condition caused by vacuum leaks, low fuel pressure, inaccurate MAF (mass airflow
sensor)
3- poor fuel quality
4- possible inefficient cat. convertor, but this will usually give a different code.
A scanner to read data is really the key to diag. this code. The main test is to disconnect sensor,
ground the low reference circuit, and look and scanner data to verify voltage range. If passes,
then pcm and wiring are all good.
Some common areas of vacuum leak are at the throttle body gasket, pcv hose,
lower intake manifold gaskets.

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