I got a check engine light on, GM code P1639 five volts fer, circuit 2. The dealer changed the AC pressure sensor. The light came back on would live data show if something is too high or low? Or the freeze frame shows what caused the light to come on? It does not show a code, but when I look at the o2 sensor data it shows rich to lean response to lean to rich switches response ratio fail. What would cause that? My manual shows codes like 23 and 25 instead od P ____ codes. Any help will be appreciated. Thanks
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Sunday, December 31st, 2017 AT 3:35 AM