PO171, PO174, PO733, PO734 Code Advice Needed

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PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 11:33:50 AM    D2Steve   Posts: 3 Joined: 7/1/2008 Status: offline Newbie, here. Just went to Autozone to have my check engine light diagnosed and the following codes came up: PO171, PO174, PO733 and PO734. After perusing the forum I saw that it could be fuel filter and/or mass air flow sensor related. I guess I would like some advice on what steps I should take to aleviate these issues (starting with the cheapest options, obviously). A couple of other questions: I found the mass air flow sensor on roverparts.com for $217.95. Is this a decent price? If not, any suggestions on where else I should look. And, for the fuel filter, Autozone is asking for the following engine type: 8 Cylinders 2 4.0L MFI (found in 66% of 2001 Land Rover Discovery II) 8 Cylinders 5 4.0L MFI (found in 34% of 2001 Land Rover Discovery II) How do I find out which engine I have? Thanks in advance, Steve Post #: 1

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 11:38:36 AM    Disco Mike Posts: 9587 Joined: 4/27/2006 Status: offline D2''s don''t have fuel filters. Call Tony at Cerrones, 650-365-4145. I believe his prices are in the $180 range. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to D2Steve) Post #: 2

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 12:49:26 PM    D2Steve   Posts: 3 Joined: 7/1/2008 Status: offline Thanks, Mike (I told you I was a Newbie). So I take it you believe it''s the Mass Air Flow Sensor? Could this be causing the 733/734 codes, too? (in reply to Disco Mike) Post #: 3

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 1:20:53 PM    Disco Mike Posts: 9587 Joined: 4/27/2006 Status: offline All part of the fault code package when the MAF fails. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to D2Steve) Post #: 4

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 1:40:45 PM    D2Steve   Posts: 3 Joined: 7/1/2008 Status: offline Thank you, Mike. (in reply to Disco Mike) Post #: 5

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 2:16:29 PM    jkid Posts: 539 Joined: 9/26/2007 Status: offline Check all the hoses on the engine for vacuum leaks, make sure all the connections are tight. That''s the cheapest place to start. _____________________________ 01 D2 SE (90K miles) Stock For now 1982 Mercedes 300SD (270k miles) (in reply to D2Steve) Post #: 6

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 2:31:05 PM    Disco Mike Posts: 9587 Joined: 4/27/2006 Status: offline Always good to do but has nothing to due with these codes. _____________________________ Mike Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers. 99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45. (in reply to jkid) Post #: 7

RE: PO171, PO174, PO733, PO734 Code Advice Needed - 7/1/2008 5:37:16 PM    jkid Posts: 539 Joined: 9/26/2007 Status: offline Sorry, I should have elaborated. I had all of these codes on my truck. I had these codes over the course of a few months. First one tranny code every once in a while, then the lean codes and then all four codes everytime it was driven. A new MAF did not fix it. I tightened one of the hoses that threads into the throttle body plenum and I never got a code again. I''m guessing the connection was slowly loosening up over time. It makes sense: bad MAF = unmetered air getting in and a vacuum leak = unmetered air getting in and making it run too lean. _____________________________ 01 D2 SE (90K miles) Stock For now 1982 Mercedes 300SD (270k miles) (in reply to Disco Mike) Post #: 8

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