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1998 Pontiac Sunfire 2.2L what do the codes C2770, C1223, and U2023 mean?

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1998 Pontiac Sunfire 2.2L what do the codes C2770, C1223, and U2023 mean?

Vehicle: 1998 Pontiac Sunfire 2.2L

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Best answer

C1223 Left rear wheel speed sensor

The only valid code you have is C1223., C 1223 is faulty rear left speed sensor

Pontiac Sunfire Wheel Speed Sensor 

The fix is to replace the rear wheel speed sensor

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