1987 Buick Century Code 42

1987 BUICK CENTURY
130,000 MILES • 4 CYL • 2WD • AUTOMATIC
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HANSEN34
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  • 1 POST
Checked the codes for this car and it lists codes 21, 34 & 42. Took care of 21 but cannot figure out what 34 & 42 are and where the sensors are located. Any help would be appreciated.
Aug 8, 2008 at 6:09 PM
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BMRFIXIT
  • ✓ASE Certified Mechanic
  • 19,053 POSTS
  • ASE Certified Mechanic
DTC 34 is MAF sensor Signal volts too low
check wiring and sensor
sensor located after the air filter and before or on the throttle body


DTC 42
open or short to ground in the electronic spark module or the by-pass circuits


good luck
Aug 8, 2008 at 10:47 PM
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