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Ford P2196 Code – O2 Sensor Stuck Rich Bank 1 Limited Safe to drive : Ford vehicles only Applies only to : Not applicable to : This explanation does NOT apply to Toyota, BMW, GM, VW, or other manufacturers. Medium Severity level : When Does This Code Appear on the Vehicles Ford P2196 is commonly associated with rich running conditions and poor fuel economy. What This Code means on the Vehicles On Ford vehicles, P2196 indicates the upstream oxygen sensor on Bank 1 is stuck rich. Why This is different from a generic OBD2 Code Ford fuel systems often cause rich readings without sensor failure. Common Situations That Trigger This Code Leaking injectors; High fuel pressure; Contaminated MAF sensor. What Will NOT Fix This Code Replacing catalytic converter; Replacing downstream sensors. How to Clear This Code on Vehicles Inspect fuel delivery, clean MAF, clear code. Related Manufacturer Specific Codes Ford P0172; Ford P2195 Previous Next

BMW U2101 Code – MOST Bus Invalid Data Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. Medium Severity level : When Does This Code Appear on the Vehicles BMW U2101 shows when one module reports invalid data to MOST bus. What This Code means on the Vehicles Invalid module data on BMW MOST bus. Why This is different from a generic OBD2 Code Generic scanners cannot detect MOST bus invalid data issues. Common Situations That Trigger This Code Faulty module; Wiring damage; Aftermarket device interference. What Will NOT Fix This Code Replacing unrelated modules. How to Clear This Code on Vehicles Diagnose module and wiring; clear via ISTA. Related Manufacturer Specific Codes BMW U2100; BMW U2102 Previous Next

BMW U2202 Code – DSC Rear Axle Sensor Timeout Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. Medium Severity level : When Does This Code Appear on the Vehicles BMW U2202 occurs when DSC module reports timeout on rear axle sensors. What This Code means on the Vehicles BMW-specific DSC rear axle sensor timeout warning. Why This is different from a generic OBD2 Code Standard scanners cannot detect BMW-specific DSC rear axle timeouts. Common Situations That Trigger This Code Faulty sensor; Wiring harness damage; Module malfunction. What Will NOT Fix This Code Ignoring DSC alert; Replacing unrelated parts. How to Clear This Code on Vehicles Inspect wiring and sensors; clear via ISTA. Related Manufacturer Specific Codes BMW U2200; BMW U2201 Previous Next

Toyota U1410 Code – CAN Bus Airbag Module Communication Lost Limited Safe to drive : Toyota vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. High Severity level : When Does This Code Appear on the Vehicles U1410 occurs when CAN bus loses communication with airbag control module. What This Code means on the Vehicles Toyota-specific communication fault between modules. Why This is different from a generic OBD2 Code Generic scanners cannot report Toyota OEM airbag CAN bus errors. Common Situations That Trigger This Code Wiring harness damage; Module failure; Aftermarket interference. What Will NOT Fix This Code Clearing code without repairing wiring or module. How to Clear This Code on Vehicles Inspect wiring and module; clear code using Techstream. Related Manufacturer Specific Codes Toyota U1411; Toyota U1412 Previous Next

BMW 2A82 Code – VANOS Intake Solenoid Fault Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to generic OBD-II systems. Medium Severity level : When Does This Code Appear on the Vehicles BMW 2A82 often appears with reduced engine performance. What This Code means on the Vehicles BMW 2A82 indicates VANOS intake solenoid malfunction. Why This is different from a generic OBD2 Code This is a BMW-specific shadow code not readable by generic scanners. Common Situations That Trigger This Code Contaminated oil; Failed VANOS solenoid. What Will NOT Fix This Code Clearing code without fixing oil contamination. How to Clear This Code on Vehicles Replace or clean VANOS solenoid and service engine oil. Related Manufacturer Specific Codes BMW 2A87; BMW P0012 Previous Next

BMW U2201 Code – DSC Rear Wheel Signal Mismatch Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. Medium Severity level : When Does This Code Appear on the Vehicles BMW U2201 occurs when DSC module detects inconsistent signals from rear wheels. What This Code means on the Vehicles BMW-specific rear wheel DSC signal mismatch. Why This is different from a generic OBD2 Code Generic scanners cannot detect BMW-specific DSC rear wheel logic. Common Situations That Trigger This Code Wiring issues; Sensor failure; Module calibration needed. What Will NOT Fix This Code Replacing unrelated sensors. How to Clear This Code on Vehicles Inspect wiring and sensors; recalibrate DSC; clear via ISTA. Related Manufacturer Specific Codes BMW U2200; BMW U2202 Previous Next

BMW P2002 Code – DSC Wheel Rotation Mismatch Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. Medium Severity level : When Does This Code Appear on the Vehicles BMW P2002 appears when DSC detects inconsistent wheel rotation data across wheels. What This Code means on the Vehicles BMW-specific DSC warning on sensor data mismatch. Why This is different from a generic OBD2 Code Generic scanners cannot detect cross-wheel sensor mismatch within DSC. Common Situations That Trigger This Code Faulty sensor; Tone ring damage; Improper wheel alignment. What Will NOT Fix This Code Replacing only one sensor without checking all wheels. How to Clear This Code on Vehicles Inspect all wheel sensors; check DSC module; clear using ISTA. Related Manufacturer Specific Codes BMW P2000; BMW P2001 Previous Next

Toyota P0A0F Code – Engine Failed to Start No Safe to drive : Toyota and Lexus hybrid vehicles only Applies only to : Not applicable to : This explanation does NOT apply to non-hybrid vehicles or other manufacturers. High Severity level : When Does This Code Appear on the Vehicles Toyota P0A0F appears when the engine fails to start after multiple attempts. What This Code means on the Vehicles On Toyota hybrids, P0A0F indicates engine failed to start. Why This is different from a generic OBD2 Code This code is hybrid-specific and does not exist on non-hybrid vehicles. Common Situations That Trigger This Code Fuel delivery failure; Faulty crankshaft sensor; Throttle body issues. What Will NOT Fix This Code Replacing hybrid battery; Clearing code without diagnosing engine start system. How to Clear This Code on Vehicles Diagnose engine start system, fuel, ignition, and airflow before clearing the code. Related Manufacturer Specific Codes Toyota P3190; Toyota P0335 Previous Next

BMW P2301 Code – Cylinder 2 Misfire Limited Safe to drive : BMW vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other brands. High Severity level : When Does This Code Appear on the Vehicles P2301 occurs when misfire detected on cylinder 2. What This Code means on the Vehicles BMW-specific cylinder 2 misfire detected by engine module. Why This is different from a generic OBD2 Code Generic scanners cannot map misfire to BMW cylinder-specific codes accurately. Common Situations That Trigger This Code Spark plug; Ignition coil; Fuel injector fault. What Will NOT Fix This Code Ignoring coil or injector; Replacing unrelated components. How to Clear This Code on Vehicles Inspect cylinder 2 coil and plug; test injector; clear via ISTA. Related Manufacturer Specific Codes BMW P2300; BMW P2302 Previous Next

Diagnostic Codes List This page provides a structured reference list of automotive Diagnostic Trouble Codes (DTCs) used by modern vehicle onboard diagnostic systems. Diagnostic codes are generated by the ECU when a fault is detected in the engine, transmission, emissions system, vehicle network, or other electronic control systems. Each code represents a specific fault condition and serves as the starting point for vehicle diagnostics and troubleshooting. This Diagnostic Codes List allows technicians and automotive professionals to browse fault codes by system category, quickly identify code meanings, and access detailed diagnostic information for each individual code. By selecting a specific diagnostic code, you can view in-depth explanations including fault descriptions, affected systems, common causes, diagnostic procedures, and recommended inspection steps based on real-world diagnostic scenarios. This list is designed to support efficient fault identification and accurate diagnosis using professional diagnostic tools, live data analysis, and vehicle-specific diagnostic workflows. Select by System A/C ABS Airbag Body Body, Electrical Emissions Engine Engine, Emissions Idle Control Network Network, Body Security Steering Transmission Vehicle Speed Quick Search P0101 Diagnostic trouble code P0101 indicates that the mass air flow (MAF) sensor signal is outside the expected range or does not match engine operating conditions calculated by the ECM Read More P0102 Diagnostic trouble code P0102 indicates that the mass air flow (MAF) sensor signal is lower than the minimum expected value detected by the ECM Read More P0103 Diagnostic trouble code P0103 indicates that the mass air flow (MAF) sensor signal is higher than the normal operating range expected by the ECM Read More P0104 Diagnostic trouble code P0104 indicates an intermittent or erratic signal from the mass air flow (MAF) sensor circuit Read More P0105 Diagnostic trouble code P0105 indicates a malfunction in the manifold absolute pressure (MAP) or barometric pressure sensor circuit detected by the ECM Read More P0106 Diagnostic trouble code P0106 indicates that the manifold absolute pressure (MAP) sensor signal is outside the expected range or does not correlate with engine operating conditions calculated by the ECM Read More P0107 Diagnostic trouble code P0107 indicates that the MAP sensor signal is lower than the minimum expected voltage detected by the ECM Read More P0108 Diagnostic trouble code P0108 indicates that the MAP sensor signal is higher than the expected operating range detected by the ECM Read More P0109 Diagnostic trouble code P0109 indicates an intermittent or erratic signal from the MAP sensor circuit detected by the ECM Read More P0110 Diagnostic trouble code P0110 indicates a malfunction in the intake air temperature (IAT) sensor circuit detected by the ECM Read More P0111 Diagnostic trouble code P0111 indicates that the intake air temperature (IAT) sensor signal is outside the expected range or performance limits Read More P0112 Diagnostic trouble code P0112 indicates that the intake air temperature sensor signal is lower than the expected value detected by the ECM Read More P0113 Diagnostic trouble code P0113 indicates that the intake air temperature sensor signal is higher than the normal operating range detected by the ECM Read More P0114 Diagnostic trouble code P0114 indicates an intermittent or erratic signal from the intake air temperature (IAT) sensor circuit Read More P0115 Diagnostic trouble code P0115 indicates a malfunction in the engine coolant temperature (ECT) sensor circuit detected by the ECM Read More P0116 Diagnostic trouble code P0116 indicates that the engine coolant temperature sensor signal is outside the expected range or performance limits Read More P0117 Diagnostic trouble code P0117 indicates that the engine coolant temperature sensor signal is lower than the expected value detected by the ECM Read More P0118 Diagnostic trouble code P0118 indicates that the engine coolant temperature sensor signal is higher than the normal operating range detected by the ECM Read More P0119 Diagnostic trouble code P0119 indicates an intermittent or erratic signal from the engine coolant temperature sensor circuit Read More P0125 Diagnostic trouble code P0125 indicates insufficient engine coolant temperature for closed-loop fuel control operation Read More P0126 Diagnostic trouble code P0126 indicates insufficient coolant temperature for stable engine operation detected by the ECM Read More P0127 Diagnostic trouble code P0127 indicates that the intake air temperature is higher than the maximum expected value detected by the ECM Read More P0128 Diagnostic trouble code P0128 indicates that the engine coolant temperature is below the thermostat regulating temperature for too long during operation Read More P0130 Diagnostic trouble code P0130 indicates a malfunction in the oxygen sensor circuit for Bank 1 Sensor 1 detected by the ECM Read More P0131 Diagnostic trouble code P0131 indicates that the oxygen sensor circuit voltage is lower than expected for Bank 1 Sensor 1, as detected by the ECM Read More P0132 Diagnostic trouble code P0132 indicates that the oxygen sensor circuit voltage is higher than expected for Bank 1 Sensor 1 Read More P0133 Diagnostic trouble code P0133 indicates a slow response from the oxygen sensor circuit for Bank 1 Sensor 1 Read More P0134 Diagnostic trouble code P0134 indicates no activity detected in the oxygen sensor circuit for Bank 1 Sensor 1 Read More P0135 Diagnostic trouble code P0135 indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 1 Read More P0136 Diagnostic trouble code P0136 indicates a malfunction in the oxygen sensor circuit for Bank 1 Sensor 2 Read More P0137 Diagnostic trouble code P0137 indicates low voltage in the oxygen sensor circuit for Bank 1 Sensor 2 Read More P0138 Diagnostic trouble code P0138 indicates high voltage in the oxygen sensor circuit for Bank 1 Sensor 2 Read More P0139 Diagnostic trouble code P0139 indicates a slow response from the oxygen sensor circuit for Bank 1 Sensor 2 Read More P0140 Diagnostic trouble code P0140 indicates no activity detected in the oxygen sensor circuit for Bank 1 Sensor 2 Read More P0141 Diagnostic trouble code P0141 indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 2 Read More P0147 Diagnostic trouble code P0147 indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 3 Read More P0150 Diagnostic trouble code P0150 indicates a malfunction in the oxygen sensor circuit for Bank 2 Sensor 1 Read More P0151 Diagnostic trouble code P0151 indicates low voltage in the oxygen sensor circuit for Bank 2 Sensor 1 Read More P0152 Diagnostic trouble code P0152 indicates high voltage in the oxygen sensor circuit for Bank 2 Sensor 1 Read More P0153 Diagnostic trouble code P0153 indicates a slow response from the oxygen sensor circuit for Bank 2 Sensor 1 Read More P0154 Diagnostic trouble code P0154 indicates no activity detected in the oxygen sensor circuit for Bank 2 Sensor 1 Read More P0155 Diagnostic trouble code P0155 indicates a malfunction in the oxygen sensor heater circuit for Bank 2 Sensor 1 Read More P0156 Diagnostic trouble code P0156 indicates a malfunction in the oxygen sensor circuit for Bank 2 Sensor 2 Read More P0157 Diagnostic trouble code P0157 indicates low voltage in the oxygen sensor circuit for Bank 2 Sensor 2 Read More P0170 Diagnostic trouble code P0170 indicates a fuel trim malfunction on Bank 1 detected by the ECM Read More P0171 Diagnostic trouble code P0171 indicates that the engine is running too lean on Bank 1 Read More P0172 Diagnostic trouble code P0172 indicates that the engine is running too rich on Bank 1 Read More P0173 Diagnostic trouble code P0173 indicates a fuel trim malfunction on Bank 2 detected by the ECM Read More P0174 Diagnostic trouble code P0174 indicates that the engine is running too lean on Bank 2 Read More P0175 Diagnostic trouble code P0175 indicates that the engine is running too rich on Bank 2 Read More View More

Learn what P0749 means and how to diagnose torque converter clutch solenoid circuit faults P0749 Overview Code P0749 Code Type P Code Class P0 System Transmission Severity Level High Emissions Related true Drivability Impact Major Diagnostic Protocol OBD2 Freeze Frame Useful true Code Definition Diagnostic trouble code P0749 indicates a malfunction in the torque converter clutch solenoid circuit Symptoms Slipping transmission Engine stalling Overview applies to this diagnostic code. Affected Systems On This Page Code Definition Symptoms Affected Systems Possible Causes Diagnostic Steps Drive Safety Notes More Resources Diagnostic Trouble Codes Diagnostic Q&A Automotive Knowledge Base All Diagnostic Products Torque converter clutch solenoid Possible Causes Faulty torque converter solenoid Wiring issues Diagnostic Steps 1 Inspect TCC solenoid2 Test solenoid circuit Drive Safety Notes A malfunctioning solenoid can cause poor shifting and stalling