Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1999REGAL LSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0100-P0134
1999 Buick Regal LS
Engine Control System - Tests W/Codes - DTC P0100-P0134
1999 Buick Regal LSSECTION Engine Control System - Tests W/Codes - DTC P0100-P0134
- Model Identification
- DTC P0100
- DTC P0101
- DTC P0101: MAF System Performance (3.0L "V" Body)
- DTC P0101: MAF System Performance (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0101: MAF System Performance (3.5L "W" Body & 4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0101: MAF System Performance (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0101: MAF System Performance (4.0L "G" Body & 4.6L DEVILLE & ELDORADO)
- DTC P0101: MAF System Performance (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0101: MAF System Performance (4.6L SEVILLE)
- DTC P0101: MAF System Performance (5.7L "F" & "Y" Bodies)
- DTC P0102
- DTC P0102: MAF Sensor Circuit-Low Frequency (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0102: MAF Sensor Circuit-Low Frequency (3.5L "W" Body)
- DTC P0102: MAF Sensor Circuit-Low-Frequency (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0102: MAF Sensor Circuit-Low Frequency (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0102: MAF Sensor Circuit-Low Frequency (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0102: MAF Sensor Circuit-Low Frequency (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0102: MAF Sensor Circuit-Low Frequency (5.7L "F" & "Y" Bodies)
- DTC P0103
- DTC P0103: MAF Sensor Circuit-High Frequency (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0103: MAF Sensor Circuit-High Frequency (3.5L "W" Body)
- DTC P0103: MAF Sensor Circuit-High Frequency (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0103: MAF Sensor Circuit-High Frequency (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0103: MAF Sensor Circuit-High-Frequency (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P","S" & "T" Series)
- DTC P0103: MAF Sensor Circuit-High-Frequency (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0103: MAF Sensor Circuit-High Frequency (5.7L "F" & "Y" Bodies)
- DTC P0105
- DTC P0105: Map Sensor Circuit Range/Performance (1.9L SATURN)
- DTC P0105: Map/TP Sensor Performance/Range (2.2L & 2.4L "J" Body & 2.4L ALERO & Grand Am "N" Body)
- DTC P0105: Map/TP Sensor Performance/Range (2.2L "S" Series & Cutlass & MALIBU 2.4L "N" Body)
- DTC P0105: Map Sensor Circuit-Insufficient Activity (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0106
- DTC P0107
- DTC P0107: Map Sensor Circuit-Low Voltage (1.9L SATURN)
- DTC P0107: Map Sensor Circuit-Low Voltage (2.2L "J" Body & "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0107: Map Sensor Circuit-Low Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0107: Map Sensor Circuit-Low Voltage (3.5L "W" Body)
- DTC P0107: Map Sensor Circuit-Low Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0107: Map Sensor Circuit-Low Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0107: Map Sensor Circuit-Low Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0107: Map Sensor Circuit-Low Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0107: Map Sensor Circuit-Low Voltage (5.7L "F" & "Y" Bodies)
- DTC P0108
- DTC P0108: Map Sensor Circuit-High Voltage (1.9L SATURN)
- DTC P0108: Map Sensor Circuit-High Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0108: Map Sensor Circuit-High Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0108: Map Sensor Circuit-High Voltage (3.5L "W" Body)
- DTC P0108: Map Sensor Circuit-High Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0108: Map Sensor Circuit-High Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0108: Map Sensor Circuit-High Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0108: Map Sensor Circuit-High Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series Trucks)
- DTC P0108: Map Sensor Circuit-High Voltage (5.7L "F" & "Y" Bodies)
- DTC P0110
- DTC P0111
- DTC P0112
- DTC P0112: IAT Sensor Circuit-High Temperature (1.9L SATURN)
- DTC P0112: IAT Sensor Circuit-Low Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0112: IAT Sensor Circuit-Low Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0112: IAT Sensor Circuit-Low Voltage (3.5L "W" Body)
- DTC P0112: IAT Sensor Circuit-Low Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0112: IAT Sensor Circuit-Low Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0112: IAT Sensor Circuit-Low Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0112: IAT Sensor Circuit-Low Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
- DTC P0113
- DTC P0113: IAT Sensor Circuit-Low Temperature (1.9L SATURN)
- DTC P0113: IAT Sensor Circuit-High Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0113: IAT Sensor Circuit-High Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0113: IAT Sensor Circuit-High Voltage (3.5L "W" Body)
- DTC P0113: IAT Sensor Circuit-High Voltage (3.8L "C", "F", "G" & "H" Bodies)
- DTC P0113: IAT Sensor Circuit-High Voltage (3.8L "W" Body)
- DTC P0113: IAT Sensor Circuit-High Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0113: IAT Sensor Circuit-High Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0113: IAT Sensor Circuit-High Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0113: IAT Sensor Circuit-High Voltage (5.7L "F" & "Y" Bodies)
- DTC P0115
- DTC P0116
- DTC P0117
- DTC P0117: ECT Sensor Circuit-High Temperature (1.9L SATURN)
- DTC P0117: ECT Sensor Circuit-Low Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0117: ECT Sensor Circuit-Low Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0117: ECT Sensor Circuit-Low Voltage (3.5L "W" Body)
- DTC P0117: ECT Sensor Circuit-Low Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0117: ECT Sensor Circuit-Low Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0117: ECT Sensor Circuit-Low Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0117: ECT Sensor Circuit-Low Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
- DTC P0118
- DTC P0118: ECT Sensor Circuit-Low Temperature (1.9L SATURN)
- DTC P0118: ECT Sensor Circuit-High Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0118: ECT Sensor Circuit-High Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0118: ECT Sensor Circuit-High Voltage (3.5L "W" Body)
- DTC P0118: ECT Sensor Circuit-High Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0118: ECT Sensor Circuit-High Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0118: ECT Sensor Circuit-High Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0118: ECT Sensor Circuit-High Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
- DTC P0120
- DTC P0121
- DTC P0121: TP Sensor Performance (2.2L "J" Body)
- DTC P0121: TP Sensor Performance (2.4L "N" Body)
- DTC P0121: TP Sensor Performance (3.1L "N" & "W" Bodies & 3.4L "U" Series)
- DTC P0121: TP Sensor Performance (3.4L "N" Body)
- DTC P0121: TP Sensor Performance (3.5L "W" Body)
- DTC P0121: TP Sensor Performance (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0121: TP Sensor Circuit Insufficient Activity (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0121: TP Sensor Performance (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0121: TP Sensor Circuit-Insufficient Activity (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0121: TP Sensor Circuit-Insufficient Activity (5.7L "F" Body)
- DTC P0122
- DTC P0122: TP Sensor Circuit-Low Voltage (1.9L SATURN)
- DTC P0122: TP Sensor Circuit-Low Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0122: TP Sensor Circuit-Low Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0122: TP Sensor Circuit-Low Voltage (3.5L "W" Body)
- DTC P0122: TP Sensor Circuit-Low Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0122: TP Sensor Circuit-Voltage Low (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0122: TP Sensor Circuit-Low Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0122: TP Sensor Circuit-Low Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0122: TP Sensor Circuit-Low Voltage (5.7L "F" Body)
- DTC P0123
- DTC P0123: TP Sensor Circuit-High Voltage (1.9L SATURN)
- DTC P0123: TP Sensor Circuit-High Voltage (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0123: TP Sensor Circuit-High Voltage (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0123: TP Sensor Circuit-High Voltage (3.5L "W" Body)
- DTC P0123: TP Sensor Circuit-High Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0123: TP Sensor Circuit-High Voltage (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0123: TP Sensor Circuit-High Voltage (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0123: TP Sensor Circuit-High Voltage (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0123: TP Sensor Circuit High Voltage (5.7L "F" Body)
- DTC P0125
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (1.9L SATURN)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
- DTC P0130
- DTC P0131
- DTC P0131: O2S Circuit-Low Voltage-Sensor 1 (1.9L SATURN)
- DTC P0131: O2S Circuit-Low Voltage-Sensor 1 (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0131: Ho2S Circuit-Low Voltage-Bank 1, Sensor 1 (3.0L "V" Body)
- DTC P0131: Ho2S Circuit-Low Voltage-Sensor 1 (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0131: Ho2S Circuit-Low Voltage-Sensor 1 (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0131: Ho2S Circuit-Low Voltage-Bank 1, Sensor 1 (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0131: Ho2S Circuit-Low Voltage-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0131: Ho2S Circuit-Low Voltage-Bank 1, Sensor 1 (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
- DTC P0132
- DTC P0132: O2S Circuit-High Voltage-Sensor 1 (1.9L SATURN)
- DTC P0132: O2S Circuit-High Voltage-Sensor 1 (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0132: Ho2S Circuit-High Voltage-Bank 1, Sensor 1 (3.0L "V" Body)
- DTC P0132: Ho2S Circuit High Voltage Sensor 1 (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0132: Ho2S 1 Circuit High Voltage (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0132: Ho2S Circuit-High Voltage-Bank 1, Sensor 1 (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0132: Ho2S Circuit-High Voltage-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0132: Ho2S Circuit-High Voltage-Bank 1, Sensor 1 (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0132: Ho2S Circuit-Voltage High-Bank 1, Sensor 1 (5.7L "F" & "Y" Bodies)
- DTC P0133
- DTC P0133, P1133 Or P1134: O2S Circuit-Slow Response-Sensor 1 (1.9L SATURN)
- DTC P0133: O2S Circuit-Slow Response-Sensor 1 (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0133: Ho2S Circuit-Slow Response-Sensor 1 (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0133: Ho2S 1 Circuit-Slow Response-Sensor 1 (3.5L "W" Body)
- DTC P0133: Ho2S 1 Circuit-Slow Response-Sensor 1 (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0133: Ho2S Circuit-Slow Response-Bank 1, Sensor 1 (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0133: Ho2S Circuit-Slow Response-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K", "L", "M", "P", "S" & "T" Series)
- DTC P0133: Ho2S Circuit-Slow Response-Bank 1, Sensor 1 (4.8L, 5.3L & 6.0L "C" & "K" Series)
- DTC P0133: Ho2S Circuit-Slow Response-Bank 1, Sensor 1 (5.7L "F" & "Y" Bodies)
- DTC P0134
- DTC P0134: O2S Circuit-Insufficient Activity-Sensor 1 (1.9L SATURN)
- DTC P0134: O2S Circuit-Insufficient Activity-Sensor 1 (2.2L "J" Body, 2.2L "S" Series & 2.4L "J" & "N" Bodies)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Bank 1, Sensor 1 (3.0L "V" Body)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Sensor 1 (3.1L "N" & "W" Bodies & 3.4L "N" Body & "U" Series)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Sensor 1 (3.5L "W" Body)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Sensor 1 (3.8L "C", "F", "G", "H" & "W" Bodies)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Bank 1, Sensor 1 (4.0L "G" Body & 4.6L "E" & "K" Bodies)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Bank 1, Sensor 1 (4.3L, 5.0L, 5.7L & 7.4L "C", "G", "K" & "L", "M", "P", "S" & "T" Series)
- DTC P0134: Ho2S Circuit-Insufficient Activity-Bank 1, Sensor 1 (4.8L, 5.3L & 6.0L "C" & "K" Series & 5.7L "F" & "Y" Bodies)
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.