Acura vehicles use an onboard diagnostic system to monitor performance and store trouble codes when issues arise. These OBD-II codes help identify problems ranging from engine misfires to transmission faults.
Understanding the difference between generic and manufacturer-specific codes is essential for accurate diagnosis. Proper troubleshooting ensures repairs meet factory standards and restore optimal vehicle operation.
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Understanding OBD-II Codes
Modern Acura models rely on OBD-II systems to detect and report mechanical or electrical faults. When the check engine light illuminates, the system has stored a specific alphanumeric code.
These codes are divided into generic (P0xxx) and manufacturer-specific (P1xxx) categories. Generic codes cover universal systems like fuel metering, emissions, and ignition across all vehicle makes.
Acura-Specific Trouble Codes Explained
Manufacturer-specific codes are unique to Honda and Acura engineering. These P1xxx codes require specialized diagnostic knowledge to interpret correctly and test specific actuators or sensors.
If your check engine light illuminates, accurate diagnosis ensures repairs meet factory standards. Less common codes may require advanced bidirectional scan tools to properly command and test components.
Diagnosing Issues With OBD-II Codes
Diagnosing Acura issues requires a structured approach to differentiate between generic and manufacturer-specific faults. Follow these steps for accurate troubleshooting and repair verification.
- Understand code categories: Determine the correct diagnostic path based on generic or manufacturer-specific definitions.
- Consult factory resources: Use official service information and appropriate diagnostic equipment to test circuits efficiently.
- Address rare codes: Apply specialized testing procedures for less common manufacturer-specific faults.
- Verify repairs: Ensure all repairs meet exact Acura specifications before clearing codes and resetting monitors.
Most Common Acura OBD-II Trouble Codes
The following table outlines frequent manufacturer-specific trouble codes encountered on Acura applications. Always verify the exact factory definition for your specific model and engine configuration.
| Code | Description |
|---|---|
| P1101 | Mass Airflow Sensor Out of Self-Test Range |
| P1102 | Mass Air Flow Sensor In Range But Lower Than Expected |
| P1103 | Mass Air Flow (MAF) Sensor Signal Higher Than Expected |
| P1104 | MAF Ground Malfunction |
| P1105 | Manifold Absolute Pressure Sensor Malfunction |
| P1106 | Barometric Pressure Sensor Circuit Range/Performance Problem |
| P1107 | Barometric Pressure (BARO) Sensor Circuit Low Voltage |
| P1108 | Barometric Pressure (BARO) Sensor Circuit Voltage High |
| P1109 | BARO Sensor Circuit Out of Range High |
| P1110 | Intake Valve Timing Control Bank 1 |
| P1111 | Intake Air Temperature (IAT) Sensor Circuit Intermittent Voltage High |
| P1112 | IAT Sensor Circuit Intermittent Low Voltage |
| P1113 | Intake Resonance Switchover Solenoid Control Circuit Issue |
| P1114 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage |
| P1115 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage |
| P1116 | Engine Coolant Temperature Sensor Performance Problem |
| P1117 | Engine Coolant Temperature (ECT) Sensor Circuit Intermittent |
| P1118 | Manifold Absolute Temperature Circuit Low Input |
| P1119 | Oxygen Sensor Heating Circuit, Bank 2, Sensor 1 Issue |
| P1120 | Throttle Position Sensor Out Of Range |
| P1121 | Throttle Position Lower Than Expected |
| P1122 | Throttle Position Sensor Signal Higher Than Expected |
| P1123 | Long Term Fuel Trim Additive Air, Bank 1 System Too Rich |
| P1124 | Throttle Control Motor Relay Circuit Short |
| P1125 | Throttle Position Sensor Intermittent / APP Sensor Correlation |
| P1126 | Long Term Fuel Trim Additive Air, Bank 2 System Too Lean |
| P1127 | Exhaust Not Warm Enough, Downstream Sensor Not Tested |
| P1128 | Closed Loop Fuel Not Achieved Bank 1 |
| P1129 | Manifold Absolute Pressure (MAP) Sensor Circuit Higher Than Expected |
| P1130 | Heated Oxygen Sensor (HO2S) 2/3 Faulty Components |
| P1131 | Lack Of HO2S Switch – Sensor Indicates Lean (Bank 1) |
| P1132 | O2 Sensor Heating Circuit, Bank 1+2 – Sensor 1 Short to B+ |
| P1133 | Heated Oxygen Sensor (HO2S) Insufficient Switching Sensor 1 |
| P1134 | Heated Oxygen Sensor (HO2S) RH Front Slow Operation |
| P1135 | Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) |
| P1136 | Long Term Fuel Trim Additive, Fuel Bank 1 System Too Lean |
| P1137 | Lack Of Heated Oxygen Sensor Switches Bank 1 Sensor 2 |
| P1138 | Camshaft Timing Issue / Over-Retarded |
| P1139 | Long Term Fuel Trim Additive Fuel Bank 2 System Too Rich |
| P1140 | Intake Valve Timing Control Performance Bank 1 |
| P1141 | Load Calculation Cross Check Range/Performance |
| P1142 | Load Calculation Cross Check Lower Limit Exceeded |
| P1143 | Load Calculation Cross Check Upper Limit Exceeded |
| P1144 | Mass or Volume Air Flow Circuit Open/Short to Ground |
| P1145 | Mass or Volume Air Flow Circuit Short to B+ |
| P1146 | Mass or Volume Air Flow Circuit Supply Malfunction |
| P1147 | Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1 |
| P1148 | Closed Loop Control Function Bank 1 |
| P1149 | Air/Fuel Ratio Sensor 1 Circuit Range/Performance Problem |
| P1150 | Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction |
