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Need help with Code PO172 and PO175

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Old Jan 15, 2005 | 01:51 PM
  #1  
Sammzway's Avatar
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Need help with Code PO172 and PO175

Well I had my SES light come on like couple of weeks ago, stayed on for abotu 2 days, then went away. Even though I don't have the SES light on now but I still went and got the codes pulled from autozone (free ). Anyway, they gave me the print out and these two codes came up. P0172 and P0175.
This is what it says on the print out:

P0172 - The PCM has determined that during testing, the fuel system for bank1 was too rich.

P0175 - The PCM has determined that during testing, the fuel system for bank2 was too rich.

I also have a bad catalytic converter, i'm not sure if that has anything to do with this but I have no clue what these codes mean.
Any sort of help would be appreciated, thanks.
Old Jan 15, 2005 | 02:06 PM
  #2  
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Here is from FSM:
On Board Diagnosis Logic
NFEC0173
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1 (front).
The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the
ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

Malfunction is detected when fuel injection system does not operate properly, the amount of mixture ratio compensation is too large.
(The mixture ratio is too rich.)
Possible Cause
I Heated oxygen sensor 1 (front)
I Injectors
I Exhaust gas leaks
I Incorrect fuel pressure
I Mass air flow sensor
Old Jan 15, 2005 | 04:23 PM
  #3  
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MAF needs replacement and needs updated program.
Old Jan 15, 2005 | 05:24 PM
  #4  
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So I should change MAF and take it to the dealership and get the ECU resetted?
Old Jan 15, 2005 | 05:27 PM
  #5  
Sammzway's Avatar
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Originally Posted by schernov
(The mixture ratio is too rich.)
Possible Cause
I Heated oxygen sensor 1 (front)
I Injectors
I Exhaust gas leaks
I Incorrect fuel pressure
I Mass air flow sensor
Exhaust gas leaks, would that have anything to do with my catalytic converter being bad?
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