CODE P0172 FUEL TOO RICH BLANK 1 I HAVE CHANGE ...

  • Tiny
  • Anonymous
  • 2008 Toyota
  • 30,000 miles

Code p0172 fuel too rich blank 1, I have change oxizen censor, plugs still the code is there can pls help. Thx

Saturday, November 10th, 2012 AT 4:49 AM

3 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

P0172 is a rich running condition and changing the O2 sensor is not going to help. This is a rather complex code that do not indicate what is faulty. Check the air filter for clogging. If there is a return line for fule system ensure it is not clogged and check fuel pressure. It could be too high.

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Wednesday, November 14th, 2012 AT 1:49 PM
  • Tiny
  • tanjirulbasher
  • Member

I am facing the same problem with Toyota allion for last 6 month.I change O2, filter plug, engine oil sill. But still same old problem. Please give me the complete solution.

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Sunday, January 27th, 2013 AT 4:50 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

There are no direct fix for this problem as it is an operational malfunction and might not be due to a faulty component. You need to start with basic checks.
Check fuel pressure, injectors, air flow.
Try cleaning the MAF and monitor its operating condition.

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Sunday, January 27th, 2013 AT 7:12 PM

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