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Old 08-01-2013, 12:31   #1 (permalink)
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2003 Navi Codes P0172 & P0174

I have a 2003 Navi with 112K miles, I bought the truck with 109K abt 4 months ago. Shortly after buying the truck the check engine light came on throwing codes P0172 & P0174 (I think the previous owner just cleared the codes to sell it). I did not have any drivability issues, but I had some doubts that the previous owner ran premium fuel, so I ran a Lucas tune up in a bottle with the 1st 3 full tanks of gas I put in the truck. I also checked for a Vac leak and all hoses look good and I do not hear any hissing. I cleared the codes and after almost 80 miles on the nose the same codes popped up. Next I removed and cleaned the MAF and replaced the upstream O2 sensors. I cleared the codes again and drove for 330 miles and the same codes have popped for a 3rd time. I did notice a slight misfire when I am climbing steep hills. It almost seems like I have a slight miss going into 3rd gear (abt 45mph). I do not seem to have any drivability issues when driving in the city, only when I am out on the highway climbing steep hills.

Any suggestions would be greatly appreciated.

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Old 08-01-2013, 13:28   #2 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

Check for a vacuum leak.
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Old 08-01-2013, 18:58   #3 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

P0172 is bank 1 too rich, P0174 is bank 2 too lean. Are you sure those are the right numbers? One of O2's might be off causing the system to over compensate, does the idle seem normal?
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Old 08-01-2013, 19:30   #4 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

This one is going to need some diagnosis with a good scan tool and technician. To have one bank rich and the other lean isn't usually a vacuum leak. Is it a 5.4 3 valve motor?


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Old 08-01-2013, 21:08   #5 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

Maybe he means P0171. I usually see those together and not the ones he posted.
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Old 08-02-2013, 05:17   #6 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

Bert - I will see if I can arrainge a smoke test to check for a vac leak.

Cat - The codes have been 172 & 174 consistantly, but I will get the truck to Auto Zone to run the codes one more time to be certain. Idles fine, only time I get any type of mis is when Im climbing

r-clar - 5.4

Overall the codes make no sense to me, how can bank 1 be rich and bank 2 be lean, its like the truck is confused.............

Thanks for everything thus far.
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Old 08-02-2013, 20:29   #7 (permalink)
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Re: 2003 Navi Codes P0172 & P0174

If you get to the point where you need to change a sensor, unless you can prove otherwise, I'd go with bank 2. I can idle rich, but stumble and stop when too lean.
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