SES on my 1997 Pontiac Grand Am codes system too lean (bank 1), circuit no activity detected
(bank1 sensor 2), 02 heater  circuit (bank 1 sensor 2), H025/025 insufficient switching (sensor 1 or
bank 1) Motor has been previously changed.
I need to know what these codes mean

Answer:
Going by your description of the codes, and the fact that the engine was replaced, there could be
several reasons for these codes. You could have 2 bad
oxygen sensors, a wiring problem, or a
faulty pcm.First check all the fuses. Check the connections on the pcm. Possibly pinched a wiring
harness during the engine swap. Check all ground wires and make sure none are broken or not
grounded. Those grounds are on the transmission bellhousing.


2001 pontiac grand am.
Why does my grand am has a check engine light come on. I had the codes pulled from a scanner at
Autozone. They said it was p0171 and i need an oxygen sensor. Do you think this right? How do i
replace it. Where exactly is it. Thank you very much.

Answer:
Thank you for the tip/donation. It is possible that the oxygen sensor is bad. First you should check
for a vacuum leak. Some common areas of vacuum leaks on that engine are the PCV hose,
evaporative system purge solenoid valve, or upper intake manifold gaskets. A loose air intake duct
can also cause this. If there are no vacuum leaks found, then yes, it does sound like a bad oxygen
sensor.

Thanks again for tip/donation.I will send some pics of these areas to check for vacuum leaks, and
location of the oxygen sensor this code refers to.

;




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Pontiac Grand Am Oxygen Sensor Codes
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