2003 BMW X5 OBD Codes P0172 and P0175

Tiny
HARVEYS1
  • MEMBER
  • 2003 BMW X5
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 64,000 MILES
All was normal then the check engine light came on and the engine began to run roughly. The OBD codes that are stored are P0172 and P0175 System too rich on both bank 1 and 2. What should I be looking at as the probable cause of this issue.
Thank you in advance.
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Wednesday, June 24th, 2009 AT 1:01 AM

4 Replies

Tiny
RASMATAZ
  • MEMBER
Running too rich (too much fuel, not enough air)Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Wednesday, June 24th, 2009 AT 1:10 AM
Tiny
HARVEYS1
  • MEMBER
Thank you for your quick response. I assumed that I would get an 02 sensor out of limits error code?
The air filter has been changed about 5K miles ago. I will check the resistance and connections of the coolant temp sensor. Again, thank you for your quick response.
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Wednesday, June 24th, 2009 AT 1:16 AM
Tiny
PATROKLAI
  • MEMBER
I have the same issue.

In my case, the car will warm up slower than before. I removed air from the cooling system and it helped. Injector cleaner seems to improve the drive but does not fix it. I get hesitation at cruising speeds and tends to occur more frequently at low throttle.

Thanks :)
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Tuesday, October 6th, 2009 AT 10:51 PM
Tiny
HAGERTP
  • MEMBER
These are also possibly caused by an air mass sensor that has gone out of range. Plausibility is I believe the term BMW likes to use.
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Wednesday, October 7th, 2009 AT 8:51 AM

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