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Old 07-11-2005, 09:57 AM   #1
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Default Codes Guru'* needed

I have the following codes and SES light on.
PO130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
PO131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
PO171 System too Lean (Bank 1)

Theses codes were thrown b4 I put in my Intense PCM. I changed Fuel filter cleared codes and they returned a week later. Now I have changed PCM codes came back I then changed front O2 Sensor.

These Codes get thrown and SES light comes on when at Highway speed and going to pass someone. Car seems to buck and then cick in and go. Car seems to run fine and idle fine until yesterday. Yesterday after doing some Highway driving and getting back to the city, it seems like at every stop light when I try to go it bucks and seesm like it wants to stall. Yesterday was 30+ degrees Celcius with high humidity.

Just hoping someone here can give me some clues before I take it into the dealer to be scanned.

Thanks in advance.
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Old 07-11-2005, 12:55 PM   #2
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If you had an exhaust leak, throwing off the sensor, I wouldn't expect to see the malfunction fault. Only the lean.

I suspect a wiring problem between the O2 and the PCM, given the fact that it did this with two different PCM'*.

Someone with a 2000 FSM can give you the pinout from the O2 to the PCM harness for checking the resistance and voltages.
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Old 07-11-2005, 01:16 PM   #3
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Did you get a new PCM or did you send your original in to be reflashed??
If its the same computer then possibly the computer is bad
Otherwise check all the 02 wires and make sure there isnt anything suspect there..
It is also posslibe to have a defective sensor.
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Old 07-11-2005, 01:21 PM   #4
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Default Could I try this?

What about the MAF could I try to clean that or can it be cleaned? Just wondering as it seems to throw the code when I step on it to pass on the highway and did not throw it from stomping on it in the city? Could the new K&N have thrown some oil or something on the MAF sensor? Should I take it in to get the exhaust checked for any leaks?

Thanks
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Old 07-11-2005, 01:23 PM   #5
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Your MAF has nothing to do with it. You have an O2 Malfunction code.
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Old 07-11-2005, 01:28 PM   #6
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Thanks PontiacDad

I guess I will take it in then as I have no idea on how to do any checks for voltage this is way above and beyond me. This sounds like it will not be cheap to figure out CRAP.

Thanks
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Old 07-11-2005, 01:39 PM   #7
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Default Re: Thanks

Quote:
Originally Posted by mpich
Thanks PontiacDad


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Old 07-11-2005, 01:44 PM   #8
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Default Re: Thanks

Quote:
Originally Posted by willwren
Quote:
Originally Posted by mpich
Thanks PontiacDad


look at the bottom of your sig will, he obviously just got confused...
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Old 07-11-2005, 01:53 PM   #9
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Default Confused

Yep scrolled down to far thanks Will and Toastedoats. I just dred going to the dealer for this sort of stuff. Toastedoats sorry for not replying but yes it is 2 different PCM'* I sent my old one back to intense.
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Old 07-11-2005, 03:56 PM   #10
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Default Re: Could I try this?

Quote:
Originally Posted by mpich
Could the new K&N have thrown some oil or something on the MAF sensor?
When did you put the filter on in relation to your problem starting?

It could certainly be the trouble but there could be other causes. It'* not uncommon to hear of this after a filter install or clean and oil. Excess oil could be picked up in the air stream and deposited on the MAF sensor. In that case the MAF will not read the incoming air correctly and will report much less air than is actually flowing, in that case you would certainly get a lean condition.

To clean the MAF, once your intake assembly is removed, you will need to remove the MAF screen. You will need to remove the circlip around the perimeter, you can do this gently with a small screw driver to pry towards the center. Remove the MAF screen by very gently prying and edge or two and wigling it out, the screen is somewhat solid but can be easily damaged.

Use a Qtip with Rubbing Alcohol to clean the MAF wire, be extremely gentle because it'* a very small wire. If you need more details on this post back.

Otherwise, you could have melted a wire for your O2 sensor or it chaffed against something. Also, the sensor could be defective. If it does need repalcing, only use an AC Delco unit (AFS 109), other brand are known to be less effective.

Hope this helps!

Cheers,
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