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Lil Hammer
Lil Hammer, ASE Certified Technician
Category: Buick
Satisfied Customers: 194
Experience:  Ase cetified master technichian
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1999 buick regal: The service engine light is on

Customer Question

I have a 1999 buick regal . The service engine light is on. When testing it we get a code p0102. Which this says a mass air flow sensor. This has been changed . the light was reset. but it came right back on. the air charge sensor was also changed. there was a 3rd sensor changed. the light is still on . any suggestions
Submitted: 7 years ago.
Category: Buick
Expert:  Lil Hammer replied 7 years ago.

HICustomer

 

 

A code P0102 may mean that one or more of the following has happened:

  • The MAF may be disconnected, or a wiring connection may be bad
  • The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter , be careful not to apply too much oil or that can contaminate the MAF).
  • The MAF sensor may be faulty
  • The vehicle computer may be faulty (very rare)

Possible Solutions

The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:

  • Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
  • Inspect for any air leaks near the MAF sensor.
  • Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
  • Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
  • Replace the MAF sensor.

Since you have replaced the maf already you will need a scanner to watch live data stream for the mass air flow sensor. While watching the data assuming the parameters are correct(maf reading correctly). Watch the maf reading while you wiggle the connector, wiggle it slightly,hard, pull the wires but not so hard that you rip them out , while watching for an erratic reading. If nothing then you will need to follow the sensor wires while watching the data and looking for any exposed wire. The most common problem besides the sensor itself is the connector.