SOURCE: Check engine light. got 2 codes P0172 and p0175.
Unclip the 02 harness, then take out the 02 sensor. 5 minute job.
SOURCE: 3 codes present on my 2002 Envoy. p0172, p0420, and p0340,
Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.
SOURCE: P0102, P0172 codes
It sounds like the maf isn't communicating with the computer. Causing the fuel mixture to be to rich, tailpipe is probably black with soot. I would check the connection for corrosion and clean it well with some electrical contact cleaner, and then use some dielectric grease on it before reconnecting it. If that doesn't solve it check the harness for a bad wire (burnt or worn through insulation or a short). If you have a scan tool reset the computer or just disconnect the battery for a couple of minutes to erase the codes. They dont clear until the system cycles quite a few times without any codes coming up. I hope this helps.
SOURCE: how to replace the cabin air filter on the gx470
open the glove box, grasp it firmly and pull straight up on one side and then the other. the box will unsnap from the hinge, once loose lower the box gently and let it hang from the tension cord. behind the box you will see a cover with release clips. remove the cover. pull the filter and tray straight out. be sure to replace the filter proper side up, it will be marked. reassemble.
SOURCE: 2001 VW Golf 2.0 throwing error codes P0103 & P0172
Go after the Egr valve, if its sticking then there is a vacumn leak.
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