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Car Forum / Ford / Ford Explorer / June 2009'99 XLS Po171 & P0174 codes
My son's '99 XLS 4.0 (cheaper engine, I think) with 97K miles has been showing P0171 and P0174 codes for the last several months. (just came home from college today) He has been getting them reset (cleared) and after several days they come back on. Car history: Bought new in '98 and treated well. NO work of any kind has been required under the hood. He says it has not affected the performace of his Explorer and it doesn't have any problems or run rough starting in cold weather. He also left my Haynes repair manual at school. I think this is the OHV version? Most if not all of the post refer to the SOHC model. What should I start to do since he will be home for only a few days? Any help would be appreciated. /Richard > My son's '99 XLS 4.0 (cheaper engine, I think) with 97K miles > has been showing P0171 and P0174 codes for the last several months. [quoted text clipped - 13 lines] > > /Richard Here's a place that describes your trouble codes: http://www.obd-codes.com/p0171 > > My son's '99 XLS 4.0 (cheaper engine, I think) with 97K miles > > has been showing P0171 and P0174 codes for the last several months. [quoted text clipped - 19 lines] > > - Show quoted text - Thank you, I will start looking for vacume leaks and clean the MAF first. Thanks again. /Richard On May 4, 11:57 am, "Ulysses" <therealulys...@yahoo.com> wrote: > "Richard" <drgrime...@gmail.com> wrote in message > [quoted text clipped - 23 lines] > > - Show quoted text - Thank you, I will start looking for vacume leaks and clean the MAF first. Thanks again. /Richard Let's just hope it's as easy to fix as it sounds like :-) >On May 4, 11:57 am, "Ulysses" <therealulys...@yahoo.com> wrote: >> "Richard" <drgrime...@gmail.com> wrote in message [quoted text clipped - 33 lines] > >Let's just hope it's as easy to fix as it sounds like :-) O2 sensor codes are often bad sensors, at least in my experience. > >On May 4, 11:57 am, "Ulysses" <therealulys...@yahoo.com> wrote: > >> "Richard" <drgrime...@gmail.com> wrote in message news:b7b951bf-5a23-4c6b-a25a-bfd6d915d915@r3g2000vbp.googlegroups.com... > >> > My son's '99 XLS 4.0 (cheaper engine, I think) with 97K miles > >> > has been showing P0171 and P0174 codes for the last several months. [quoted text clipped - 30 lines] > > O2 sensor codes are often bad sensors, at least in my experience. I have a PO136 and a PO141 on my '97 (4.0L OHV) and my brother-in-law-mechanic told me to check the voltage at the sensor. If the voltage is good then the sensor is bad. OTOH I've had a CEL come on (same vehicle) and it went off after I cleaned the MAF, replaced the air filter, and cleaned the IAC (for good measure). It didn't come back on but in that case I didn't have a code reader available. Just dumb luck I guess. Someday I would like to see a list of all the things that make the CEL come on so guys like me can at least try a few things before spending a bunch of money. Most of my Fords aren't worth paying someone to fix. It's kinda scary cause there isn't much input in this NG any more so I can only hope my luck continues. >> >On May 4, 11:57 am, "Ulysses" <therealulys...@yahoo.com> wrote: >> >> "Richard" <drgrime...@gmail.com> wrote in message [quoted text clipped - 39 lines] >brother-in-law-mechanic told me to check the voltage at the sensor. If the >voltage is good then the sensor is bad. Some how the concept that the voltage being right at the sensor dictates the sensor is bad is puzzling... <g> >OTOH I've had a CEL come on (same vehicle) and it went off after I cleaned >the MAF, replaced the air filter, and cleaned the IAC (for good measure). >It didn't come back on but in that case I didn't have a code reader >available. Just dumb luck I guess. Could have been dumb luck, but what you did was sensible, and reasonable. >Someday I would like to see a list of all the things that make the CEL come >on so guys like me can at least try a few things before spending a bunch of >money. Most of my Fords aren't worth paying someone to fix. It's kinda >scary cause there isn't much input in this NG any more so I can only hope my >luck continues. A scan tool is your friend. Personally I own my own scan tool (OK, I have *five* of them...) but many parts stores will scan for 'free'. Frequently I can clear the DTCs for a vehicle and they won't come back on. This is always the best first start, certainly the cheapest one. Sometimes it is a transient problem, and it never reoccures. > >> >"Richard" <drgrimes11@gmail.com> wrote in message > >> [quoted text clipped - 45 lines] > Some how the concept that the voltage being right at the sensor > dictates the sensor is bad is puzzling... <g> It seems clear to me ;-) What I meant was if you have a code indicating a bad sensor and the wiring check out OK, and the proper voltage it getting TO the sensor, then the sensor must be bad. > >OTOH I've had a CEL come on (same vehicle) and it went off after I cleaned > >the MAF, replaced the air filter, and cleaned the IAC (for good measure). [quoted text clipped - 12 lines] > A scan tool is your friend. Personally I own my own scan tool (OK, I > have *five* of them...) but many parts stores will scan for 'free'. My local parts stores used to scan for free but now they say the government won't let them do it any more. I guess the Auto Mechanics Union or somebody paid off the govment. > Frequently I can clear the DTCs for a vehicle and they won't come back > on. This is always the best first start, certainly the cheapest one. > Sometimes it is a transient problem, and it never reoccures. I've had results getting the CEL to go off by disconnecting the battery for a while but that was always when I did something like disconnect the throttle position sensor which should make the CEL come on. Sooner or later I'll have to get a code reader or start buying older cars ;-). Right now I have a '99 Ranger with auto trans problems and unfortunately I think I've eliminated all of the possible electronic and sensor problems so that leaves me with needing a rebuild/replacement. If I had a bad speed sensor would it show up as a trouble code? I have no codes and have had them read twice. >> Some how the concept that the voltage being right at the sensor >> dictates the sensor is bad is puzzling... <g> > >It seems clear to me ;-) What I meant was if you have a code indicating a >bad sensor and the wiring check out OK, and the proper voltage it getting TO >the sensor, then the sensor must be bad. Perhaps misundertanding, but an O2 sensor generates voltage, and doesn't 'get' voltage. So if the voltage at the O2 sensor is right, then the sensor had to be good. <g> >> A scan tool is your friend. Personally I own my own scan tool (OK, I >> have *five* of them...) but many parts stores will scan for 'free'. > >My local parts stores used to scan for free but now they say the government >won't let them do it any more. I guess the Auto Mechanics Union or somebody >paid off the govment. You must be in one of those states where you have no freedom at all. Like CA for example where you can't wipe your butt whtout running afoul of the law! <bg> They (scan tools) are not expensive, a good investment IMHO, especially if you live there! >> Frequently I can clear the DTCs for a vehicle and they won't come back >> on. This is always the best first start, certainly the cheapest one. [quoted text clipped - 4 lines] >throttle position sensor which should make the CEL come on. Sooner or later >I'll have to get a code reader or start buying older cars ;-). Really old cars! Like from the 60's. But wait, taht won't work because some states are now forcing people to scrap these older, classic cars. > Right now I >have a '99 Ranger with auto trans problems and unfortunately I think I've >eliminated all of the possible electronic and sensor problems so that leaves >me with needing a rebuild/replacement. If I had a bad speed sensor would it >show up as a trouble code? I have no codes and have had them read twice. I guess more information about what's happening would be best. Is it a 4x4? IIRC, the sensor for speed is in the tcase, same connector as the tcase shift motor. > >> Some how the concept that the voltage being right at the sensor > >> dictates the sensor is bad is puzzling... <g> [quoted text clipped - 39 lines] > 4x4? IIRC, the sensor for speed is in the tcase, same connector as the > tcase shift motor. > >> Some how the concept that the voltage being right at the sensor > >> dictates the sensor is bad is puzzling... <g> [quoted text clipped - 6 lines] > doesn't 'get' voltage. So if the voltage at the O2 sensor is right, > then the sensor had to be good. <g> OK then. I didn't know that. Now I understand what you meant. > >> A scan tool is your friend. Personally I own my own scan tool (OK, I > >> have *five* of them...) but many parts stores will scan for 'free'. [quoted text clipped - 7 lines] > afoul of the law! <bg> They (scan tools) are not expensive, a good > investment IMHO, especially if you live there! You guessed it. I call it The Totalitarianism State. It's full of a bunch of brain-washed zombies that come from some place called "Back East" that believe whatever hogwash the government throws at them. AND they can vote. But seriously, if the government covered them with sh.t and told them it was good for them, they would LIKE it and say "thank you." > >> Frequently I can clear the DTCs for a vehicle and they won't come back > >> on. This is always the best first start, certainly the cheapest one. [quoted text clipped - 7 lines] > Really old cars! Like from the 60's. But wait, taht won't work because > some states are now forcing people to scrap these older, classic cars. I had a dream that they took away my '91 Explorer. I guess we're all supposed to buy a new car every two years. Maybe I should sell my '78 Ford pickup before they ban those. I've been told at the smog test place that they keep reducing the acceptable emissions but so far I've passed the smog tests no problem. Last year was supposed to be it's last smog test but they suspended the "30 year rollover" as they call it. I guess I won't be surprised if they do ban old cars/trucks. Hell, any state that can ban smoking OUTDOORS can do just about anything. > > Right now I > >have a '99 Ranger with auto trans problems and unfortunately I think I've [quoted text clipped - 5 lines] > 4x4? IIRC, the sensor for speed is in the tcase, same connector as the > tcase shift motor. Well, it's a '99 Ranger Reg Cab, 2WD, 3.0L V6 engine, 4R44E auto trans, regular open differential, no transfer case, one-piece driveshaft. I don't even have a repair manual for it yet. Just got it a few weeks ago :-( > On May 4, 11:57 am, "Ulysses" <therealulys...@yahoo.com> wrote: > [quoted text clipped - 36 lines] > > - Show quoted text - I cleaned the MAF (it didn't look like it needed it) and checked all of the hose connections I could find. It's been a week now and the CEL light has stayed off. I wonder if it was the extreme cold/wet this winter that tripped the light twice? Anyway so far so good!!!! Good glad to hear its fixed. By the way, your engine is the 4.0 OHV. Its not "cheaper", it might be less powerful than the SOHC or the V8, but it is a reliable bullet- proof engine. > Good glad to hear its fixed. > By the way, your engine is the 4.0 OHV. Its not "cheaper", it might be > less powerful than the SOHC or the V8, but it is a reliable bullet- > proof engine. Yes! I have three of those engines. > Good glad to hear its fixed. > By the way, your engine is the 4.0 OHV. Its not "cheaper", it might be > less powerful than the SOHC or the V8, but it is a reliable bullet- > proof engine. That's good to hear! I hope the light stays off but we will see in a couple of weeks when he comes back from school. Thanks again for all of the help. > > Good glad to hear its fixed. > > By the way, your engine is the 4.0 OHV. Its not "cheaper", it might be [quoted text clipped - 4 lines] > in a couple of weeks when he comes back from school. Thanks again > for all of the help. It's been over a month and the light has not came back on!!!!!!! |
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