1999 Chevy Tahoe MAF and catalytic converter

TIPPEY

MEMBER
1999 CHEVROLET TAHOE
V8
4WD
AUTOMATIC
165,000 MILES

The truck runs and drives good. However, has a code for MAF sensor, it also has a catalytic converter code. My question: is it possible that the MAF problem caused the catalytic converter problem? Also, If I replace the MAF; what further issues can the catalytic convertor code cause if I don't fix it for a few weeks/months? Thanks.

1 Reply

PEAR69

MECHANIC
1,482 POSTS

It is possible but not likely. The MAF sensor measures the air flow entering the engine. It sends a signal to the computer and tells it how much air is coming in. The computer then adjusts the fuel delivery according to the set parameters. If too much fuel is delivered, fuel can get into the converters and cause them to fail - however - fuel gets all the way into the converter - the oxygen sensor will fail first and your engine will run rough. Test the MAF before you go changing it. MAF sensors usually fail because of a internal electrical connection issue or because of a air intake filter that has oil on it (Like a K&N unit). To test the electrical connection, drive around a while, then tap directly on the MAF sensor with a piece of wood ( a little bit more than lightly but not too hard). If the engine sputters (even just a little bit) Replace the Sensor.