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From everything I see in this paper, it seems that it may be related to a vacuum leak. tl;dr - Check your vacuum lines and make sure none of them are cracked. Here are some more ideas from here: P2197 Lack of HO2S-21 Switch, Sensor Indicates Lean Detailed Description A heated oxygen sensor (HO2S) indicating lean at the end of a test is ...


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It seems highly likely that it's the Blower Motor Speed Controller. It's a known problem on the last couple generations of this platform and a redesigned part has been issued (8W7Z-19E624-A). It's possible that it's just a bad blower motor, or both the blower motor and controller could be bad. Good info here. The blower motor and the controller are in ...


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If you can get at the blower motor turn it on and put your hand on to see if you can feel the motor running. You may be able to feel it try to start if you have someone cycle the switch while you touch it. There is the chance the fan wheel fell off (this usually generates a racket) or a chipmunk has it packed with acorns. If you can't feel the motor start it ...



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