SES on my 1997 Pontiac Grand Am
2.4 Four cylinder
Check engine light
GM 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)
Repairs done prior = motor has been previously changed
GM tech = JK
question = I need to know what these codes mean
JK:
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.
2.4 Four cylinder
Check engine light
GM 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)
Repairs done prior = motor has been previously changed
GM tech = JK
question = I need to know what these codes mean
JK:
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.
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Problem with my 2001 pontiac grand am
Mileage = 76k
Engine size = 3.4
dash lights = check engine light
codes = lean
work done to repair = none yet.
tip/donation yes
tech = jk
question = 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.
JK:
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.
Back
Mileage = 76k
Engine size = 3.4
dash lights = check engine light
codes = lean
work done to repair = none yet.
tip/donation yes
tech = jk
question = 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.
JK:
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.
Back
