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Car Forum / BMW Cars / February 2005P1174?
Just pulled the code on my son's '96 318ti and it comes up P1174, which is something like "Fuel Trim Adaptation Malfunction"; whatever that is. Seems to run fine, although overheating, which it's being shopped for today. Anyone have this error and figured out exactly what it means? JC Here is a link to the codes, and your code isn't listed. This tells me that the list isn't complete/acccurate, or you erred in writing the code. http://www.wattora.com/Mods/OBDII/ Having said that, the code could have been stored some time ago. I would clear it and then see it it pops up again. If it does come back, then figure out what it is. > Just pulled the code on my son's '96 318ti and it comes up P1174, which > is something like "Fuel Trim Adaptation Malfunction"; whatever that is. [quoted text clipped - 3 lines] > > JC > Here is a link to the codes, and your code isn't listed. This tells me > that [quoted text clipped - 13 lines] >> >> JC P1174 is a BMW specific code so it won't show up on a generic OBDII chart. You are correct on it's meaning. It's telling you that the ECU is not able to properly adjust the fuel trim (the increase or decrease of the length of time the fuel injectors stay open) to maintain the correct air/fuel mix. If the O2 sensors are still the original, it is likely that they are no longer functioning correctly. You may also want to check around for a vacuum leak. This would cause a lean condition. These can sometimes be difficult to find and range from a cracked or disconnected hose (relatively easy to find) to a leaking injector o-ring (you need to tear apart a bunch of stuff to get to it). Kyle. >>Here is a link to the codes, and your code isn't listed. This tells me >>that [quoted text clipped - 26 lines] > > Kyle. Well, got it back from the shop yesterday afternoon and they said the engine coolant temperature sensor was bad. So only $200 later they're convinced we've got it fixed. Let you know. JC > >>Here is a link to the codes, and your code isn't listed. This tells me > >>that [quoted text clipped - 32 lines] > > Let you know. NOT wanting to argue or start a fight, but if the O2 sensor or the Coolant Temp Sensor were operating out of range, they would both throw a code, I think. I would have reset the code you had, P1174, and waited to see if it came back before I poured $200 into a repair. If the code was a fluke, and many are, then you will never know that the $200 coolant sensor actually did anything, because the code that was a fluke would, by definition of flukes, would not return anyway. That fact that it doesn't return after the new sensor _might_ mean nothing at all, if it was a fluke it wouldn't return anyway. I have an uncomfortable feeling that you spent $200 on the wrong repair. >>>>Here is a link to the codes, and your code isn't listed. This tells me >>>>that [quoted text clipped - 75 lines] > > I have an uncomfortable feeling that you spent $200 on the wrong repair. Actually, I did reset the code. It's a long(er than I thought the group would be interested in) story. But last week it was towed because of overheating with coolant loss. The shop AAA towed it to replaced a broken plastic branch fitting located under the intake manifold and a new thermostat. But this week it overheated (without coolant leak). That was the primary reason for shopping it this time (hopefully covered by warranty for the $500 of work done last week) again (note my original post). I asked them to check for vacuum leaks, thinking they may have bumped a vacuum hose while replacing coolant hoses. I posted the trouble code here expecting there was no relationship to the overheating issue. That's when they said the bad sensor was not allowing the fan to run, so it overheated in slow traffic. I too have an uncomfortable feeling they made this sensor issue up to soak me for a little more mooola. Keep in mind this is my son's car and I got most of the problem descriptions second hand and I was under a time constraint in getting the silly thing done asap. If it were a car here at home, I would have taken more time to diagnose the problem myself, and likely would have found that the fan wasn't running. So instead, I've spent near $1500 on the cooling system alone on this car since last summer. Can't wait for the kid to get out of school and on his own. Thanks for your thoughts, JC |
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