I have a 2007 Yukon Denali (6.2l V8). Every so often I get a Check Engine Light. When I check the OBD II codes it shows P0121 (Throttle Position Sensor error). I can reset this error and may not get a Check Engine Light for weeks. When it does come on it seems to happen when my wife has been dri…

P0121 error

GRoy February 1, 2017, 6:48pm 4

How do you test the TPS?

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