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Old 04-06-2013, 10:10 PM
redwrangler redwrangler is offline
Ford Motor Co
 
Join Date: Sep 2012
Posts: 169
Default CEL, P0171 and P0455

I bought this truck for $300 6 months ago. Fuel pump was out. It had a CEL before I bought the truck, but I'm unsure on the codes. I replaced the fuel pump and and fuel filter and got it running. I've been driving it to and from work for 6 months and it runs fine. I finally decided to look into the CEL. Went to autozone and came back with two codes, a P0171 and P0455.

The P0455 I understand can be a fuel cap issue, however I don't think it is that as I am extremely ocd about putting the gas cap on tight.

The P0171 states it's either running lean or rich. I'm not sure which it is, but it smells slightly rich, but then again I don't smell exhaust on the regular so that is just my hunch.

Anybody have any ideas of what could be causing the codes and what a good procedure would be to start diagnosing and correcting the problems.
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  #2  
Old 04-07-2013, 07:42 AM
Shredxcam Shredxcam is offline
Ford Tough
 
Join Date: Mar 2013
Posts: 365
Default Re: CEL, P0171 and P0455

P0171 is lean. I juust got it last night

Google it

Vacuum leaks. Fuel pressure dirty Maf

Some generic causes
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Old 04-07-2013, 08:08 AM
redwrangler redwrangler is offline
Ford Motor Co
 
Join Date: Sep 2012
Posts: 169
Default

I'm thinking its a vacuum leak, which of course is a portion of a car I've never worked on yet,

I checked the MAF and it was sparkling clean, I gave it a cleaning anyway just in case.

owner of a 2001 2.5L
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