Codes and SES on D2

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Author Message   Matt Anderson (Disco01) Senior Member Username: Disco01 Post Number: 404 Registered: 10-2003 Posted on Wednesday, April 07, 2004 - 06:25 pm:    My D2 is throwing P0171, P0174, and P0134. First two have to do with running lean and last is O2 sensor I believe. I am guessing the first two are a result of the last one. My question is, how do I know which sensor to replace? Could the MAF cause this instead of the O2? My truck has 60k, which I figure is about time for the MAF to go. What does everyone think? TIA Matthew   Dave (Plain2000dii) Member Username: Plain2000dii Post Number: 109 Registered: 05-2003 Posted on Wednesday, April 07, 2004 - 09:18 pm:    Dude, I've just been through this same set of codes. Turns out that the MAFS was bad. I tried cleaning it but the codes came back. put in a new MAFS and all's well again. $145 and maybe 15 minutes, seems to run a little better now also.   Matt Anderson (Disco01) Senior Member Username: Disco01 Post Number: 405 Registered: 10-2003 Posted on Thursday, April 08, 2004 - 12:40 am:    Thanks Dave.   Matt Anderson (Disco01) Senior Member Username: Disco01 Post Number: 407 Registered: 10-2003 Posted on Thursday, April 08, 2004 - 04:46 pm:    Replaced MAFS and light went off. Last code was PO734, not 134. Thanks again Dave. Matthew   Dave (Plain2000dii) Member Username: Plain2000dii Post Number: 115 Registered: 05-2003 Posted on Thursday, April 08, 2004 - 05:06 pm:    thats right it was 734, glad to help.