2003 GMC Envoy Q&A

2003 GMC Envoy Question: map sensor

map sensor keep going off/on replace the sensor and catalytic converter still occurs -
Answer 1
you need to find the real issue. map sensors do not go on and off. there could be a control problem. why did you replace the cat?? Roy -
Comment 1
i replace the catalytic becacaue the map sensor is suppose to be the air flow through the manifold, and i had got a catalytic below threshold code reading before . will throttle body or the oxygen sensor cause the map sensor code to pop off/on . -
Comment 2
no. the code was probably a 420 which is a cat code. the cat is longer working and must be replaced. the map sensor has little or no effect on your cat operation. Roy -
Comment 3
manifold absolute pres./barometric pres. circ code p0105 -
Comment 4
try this site. i hope it works which will show you what has to be checked for the failure. http://www.alldatapro.com/alldata/PRO~V216876810~C37496~R0~OD~N/0/89012112/94695199/94695254/94695258/34853741/34857029/34857030/34857663/122915129/105258193/105263683 Roy -
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