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Thread: Service engine code 174
10-20-2011, 08:02 PM #1
Service engine code 174
hey guys went and got gas tonight and went to walmart. when we came out started the truck to leave and soon as i put it in drive the service light came on. we took it to autozone to use their free scanner and it said 3 codes 171 and 174 twice. the print out they gave me says lean bank on one and two and MAF sensor. hasn't anyone else had this trouble?? its a 2002 tahoe 5.3 vortec flex fuel. i called the local autozone and they have one sensor instock for $80 with a $60 core with a year warranty. my question is should i go buy the new sensor and try it or take it to the shop and see what they have to say???
2002 Tahoe LT---------TINTED WINDOWS------------7" DUAL DVD INDASH
10-20-2011, 08:44 PM #2
For Both Trouble Codes.....P0171 and P0174.........may mean that one or more of the following has happened:
- The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
- There could be a vacuum leak downstream of the MAF sensor.
Edit.....A Cleaning of the MAF Sensor with......CRC's MAF Sensor Cleaner.....the 1 in the Silver Can......is most likely going to Correct the problem.
Last edited by 99'HEARTBEAT; 10-20-2011 at 08:50 PM.
10-20-2011, 08:50 PM #3
thanks 99heartbeat i'm going to try and get some maf sensor cleaner tomorrow and trying cleaning it before i replace it. also found a friend that has an actual code scanner so we are going to run it tomorrow night..
10-20-2011, 08:58 PM #4
10-23-2011, 02:27 PM #5
i took it to the car lot we bought it from yesterday morning and my buddy mechanic that works there scanned it and said it could be a few different things but not to worry about it. he cleared off the code and said if it comes back on bring and they'll look alittle harder. i cleaned the maf sensor with the cleaner when i got home. didn't look too bad but i don't know what a really dirty one looks like. we drove it 3 hour round trip last night and the light never came back on so i'm hoping it was just a fluke code and won't have anything to worry about...
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