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JOHN aka Eauto
JOHN aka Eauto, The Car Guy
Category: Chevy
Satisfied Customers: 16052
Experience:  ase tech
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2000 Chevy Tahoe: My check engine light flashes on/..50mph..light goes

Resolved Question:

I have a 2000 Chevy Tahoe. My check engine light flashes on/off whenever I go 50mph or more. If I stay off the highways for a couple days, the light goes out. My mechanic says it is most likely the Mass Air Flow sensor. Is there anything I can do besides replacing the MAFS. Why does it fail only at highway speeds?
Submitted: 6 years ago via OnlineAutoRepair.
Category: Chevy
Expert:  JOHN aka Eauto replied 6 years ago.
have you pulled diagnostic codes?
Customer: replied 6 years ago.

no, they pulled them at the garage & told me that it was most likely the MAF sensor...

Expert:  JOHN aka Eauto replied 6 years ago.

a flashing engine light is likley a miss fire and tune up is likley the answer not mass air flow sensor

The check engine light comes on when the on-board computer detects a fault in engine driveability or performance, transmission control system or transmission, or the emissions system, and a fault code is set and stored in the computer. Faults that can set the check engine light can range from a vaccuum leak, engine mis-fire, low engine compression, faulty sensor such as O2 sensor or other engine sensor, hydraulic pressure loss in transmission, transmission shift solenoid, open/short in wiring harness, emission evaporative system leak, or one of over a hundred different reasons.

The only way to know what set a fault code and turned the check engine light on is to have a diagnostic scanner hooked up to the on-board computer and read it for stored diagnostic fault codes. Many auto parts stores will do this service for free- (like auto zone)check with you local parts stores. If none in your area do, then you will have to take it to a shop and pay to have the computer read for stored fault codes.


Without knowing the fault codes numbers, it would be irresponsible to guess as to the cause as there are hundreds of possible causes."

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