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Map sensor

(2003 GMC Envoy)
in Mount Holly, NC on April 20, 2011
map sensor keep going off/on replace the sensor and catalytic converter still occurs
Displaying 1 answers & 4 comments
Popular Answer
on April 20, 2011
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
on April 21, 2011
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 .
on April 21, 2011
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
on April 28, 2011
manifold absolute pres./barometric pres. circ code p0105
on April 29, 2011
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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