Diagnostic Touble Codes for Buick Century 1990

1990 BUICK CENTURY
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RUTH HENDERSON
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  • 1 POST
What are the meanings of the following codes:

13
26
27
28
44
48

my mileage is approximately 150,000 miles

A tune-up has been done, but the car gradually stalls and then completely shuts down.
Oct 8, 2007 at 6:39 PM
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EDI3000
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  • 34 POSTS
WELL YOU COULD SAVE A LOT OF RESEARCH TIME BY STATING YOUR ENGINE SIZE. ANYWAY, IT HAS TO BE A 3.3L AND NOT THE 2.5L
13 OXYGEN SENSOR OPEN CIRCUIT
26 QUAD DRIVER CIRCUIT
27 & 28 GEAR SWITCH CIRCUITS
44 OXYGEN SENSOR LEAN EXHAUST
48 MISSFIRE, PROBABLY CAUSED BY 13, 44
I WOULD SUGGEST CHECK THE FUEL PRESSURE WITH A GAUGE. CYCLE IGN ON AND OFF TWICE, ENGINE OFF. SHOULD BE 41-47 psi APPROX.
Oct 13, 2007 at 7:32 AM
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