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Toyota P0420 Code – Catalyst Efficiency Below Threshold Yes Safe to drive : Toyota vehicles only Applies only to : Not applicable to : This explanation does NOT apply to other manufacturers. Medium Severity level : When Does This Code Appear on the Vehicles Toyota P0420 appears when emissions efficiency drops and the check engine light turns on. What This Code means on the Vehicles On Toyota vehicles, P0420 indicates catalyst efficiency below threshold. Why This is different from a generic OBD2 Code Toyota vehicles often trigger P0420 due to exhaust leaks or sensor aging rather than catalytic converter failure. Common Situations That Trigger This Code Exhaust leaks; Aging oxygen sensors; Short trip driving patterns. What Will NOT Fix This Code Replacing catalytic converter without diagnosis. How to Clear This Code on Vehicles Inspect exhaust system and O2 sensors before replacing the catalyst. Related Manufacturer Specific Codes Toyota P0430 Previous Next

GM U1000 Code – Class 2 Communication Lost No Safe to drive : GM vehicles only Applies only to : Not applicable to : This explanation does NOT apply to Chevrolet, Cadillac, Buick, or other brands. High Severity level : When Does This Code Appear on the Vehicles GM U1000 occurs when Class 2 serial data communication between modules is lost. What This Code means on the Vehicles Indicates BCM and ECM are unable to communicate over Class 2 network. Why This is different from a generic OBD2 Code Generic OBD-II scanners cannot detect U1000 communication faults. Common Situations That Trigger This Code BCM failure; Wiring harness issues; Aftermarket module interference. What Will NOT Fix This Code Replacing unrelated sensors; Clearing code without fixing communication. How to Clear This Code on Vehicles Diagnose wiring, BCM/ECM modules, use Tech2 or OEM tool to clear. Related Manufacturer Specific Codes GM U1010; GM U1040 Previous Next

Toyota C1235 Code – ABS Front Right Wheel Sensor Fault Limited Safe to drive : Toyota 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 Toyota C1235 occurs when ABS module detects front right wheel sensor error. What This Code means on the Vehicles ABS module reports front right wheel sensor fault specific to Toyota logic. Why This is different from a generic OBD2 Code Generic scanners cannot indicate exact wheel mapping for Toyota ABS. Common Situations That Trigger This Code Sensor damage; Wiring harness; Connector corrosion. What Will NOT Fix This Code Ignoring ABS alerts; Replacing unrelated parts. How to Clear This Code on Vehicles Inspect sensor and wiring; clear via Techstream. Related Manufacturer Specific Codes Toyota C1234; Toyota C1236 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