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Toyota P0171 Code – System Too Lean Bank 1 Limited Safe to drive : Toyota vehicles only Applies only to : Not applicable to : This explanation does NOT apply to Ford, BMW, GM, VW, or other manufacturers. Medium Severity level : When Does This Code Appear on the Vehicles Toyota P0171 appears when the engine runs lean and fuel economy drops. What This Code means on the Vehicles On Toyota vehicles, P0171 indicates Bank 1 is operating with insufficient fuel correction. Why This is different from a generic OBD2 Code Toyota engines commonly trigger this due to intake air leaks rather than fuel pump failure. Common Situations That Trigger This Code Cracked intake hose; Vacuum leaks; Dirty MAF sensor. What Will NOT Fix This Code Replacing oxygen sensors unnecessarily; Replacing catalytic converter. How to Clear This Code on Vehicles Repair intake leaks, clean MAF sensor, verify fuel trims. Related Manufacturer Specific Codes Toyota P0174; Toyota P0100 Previous Next

GM U1200 Code – Sensor Data Lost Limited Safe to drive : GM 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 GM U1200 appears when BCM detects loss of sensor data on Class 2 network. What This Code means on the Vehicles Sensor data missing or corrupted, reported to gateway module. Why This is different from a generic OBD2 Code Generic OBD-II cannot identify sensor-specific Class 2 communication issues. Common Situations That Trigger This Code Faulty sensor; Wiring damage; BCM software error. What Will NOT Fix This Code Replacing unrelated components. How to Clear This Code on Vehicles Diagnose sensor and BCM; clear code using OEM/Tech2. Related Manufacturer Specific Codes GM U1201; GM U1202 Previous Next

Ford P1131 Code – Lack of HO2S Switch Lean 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 P1131 appears when the PCM cannot achieve a rich condition during fuel control testing. What This Code means on the Vehicles On Ford vehicles, P1131 indicates the upstream oxygen sensor on Bank 1 remains lean during closed-loop operation. Why This is different from a generic OBD2 Code Ford uses this code to reflect fuel control response, not direct sensor failure. Common Situations That Trigger This Code Vacuum leaks; Exhaust leaks before sensor; Fuel delivery issues. What Will NOT Fix This Code Replacing catalytic converter; Clearing code without fixing lean condition. How to Clear This Code on Vehicles Diagnose unmetered air, exhaust leaks, and fuel delivery before replacing sensors. Related Manufacturer Specific Codes Ford P1151; Ford P0171 Previous Next

Toyota C1201 Code – Traction Control Disabled Limited Safe to drive : Toyota vehicles only Applies only to : Not applicable to : This explanation does NOT apply to non-Toyota vehicles. Medium Severity level : When Does This Code Appear on the Vehicles Toyota C1201 appears when ABS or traction control warning lights are on. What This Code means on the Vehicles On Toyota vehicles, C1201 indicates the ABS system has disabled traction control due to an engine or hybrid fault. Why This is different from a generic OBD2 Code Toyota uses this code as a secondary warning, not a primary ABS failure. Common Situations That Trigger This Code Engine check light present; Hybrid system faults; Reduced traction control. What Will NOT Fix This Code Replacing ABS pump; Replacing wheel speed sensors. How to Clear This Code on Vehicles Diagnose and repair engine or hybrid fault first, then clear C1201. Related Manufacturer Specific Codes Toyota P0A80; Toyota P0171 Previous Next

Toyota P0A92 Code – Hybrid Inverter High Voltage Fault Limited Safe to drive : Toyota hybrid 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 P0A92 occurs when inverter detects high voltage abnormality. What This Code means on the Vehicles High voltage anomaly detected by Toyota hybrid inverter. Why This is different from a generic OBD2 Code Generic scanners cannot detect BMW-specific thresholds. Common Situations That Trigger This Code High current draw; Battery pack issue; Wiring problem. What Will NOT Fix This Code Ignoring voltage alert; Replacing unrelated sensors. How to Clear This Code on Vehicles Inspect high-voltage lines; inverter; clear via Techstream. Related Manufacturer Specific Codes Toyota P0A90; Toyota P0A91 Previous Next

BMW P0015 Code – Exhaust Camshaft Timing Retarded Limited Safe to drive : BMW 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 BMW P0015 appears when camshaft timing is out of specification. What This Code means on the Vehicles On BMW vehicles, P0015 indicates exhaust camshaft timing over-retarded. Why This is different from a generic OBD2 Code BMW VANOS systems are sensitive to oil quality and pressure. Common Situations That Trigger This Code Dirty oil; Failing VANOS solenoids; Oil pressure issues. What Will NOT Fix This Code Replacing timing chain unnecessarily. How to Clear This Code on Vehicles Inspect oil condition, test VANOS solenoids, clear code after repair. Related Manufacturer Specific Codes BMW P0012 Previous Next

BMW U2301 Code – DSC Lateral Acceleration Sensor Fault 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 U2301 occurs when DSC module detects lateral acceleration sensor error. What This Code means on the Vehicles BMW-specific DSC lateral sensor fault. Why This is different from a generic OBD2 Code Generic scanners cannot differentiate lateral acceleration errors BMW-specifically. Common Situations That Trigger This Code Faulty sensor; Wiring damage; Module calibration issue. What Will NOT Fix This Code Ignoring sensor or module; Replacing unrelated parts. How to Clear This Code on Vehicles Inspect lateral sensor; wiring; recalibrate DSC; clear via ISTA. Related Manufacturer Specific Codes BMW U2300; BMW U2302 Previous Next

Toyota U1401 Code – CAN Bus Invalid Data 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 U1401 appears when BCM reports invalid data over CAN network. What This Code means on the Vehicles Toyota-specific invalid module data reported to network. Why This is different from a generic OBD2 Code Generic OBD-II scanners cannot report invalid CAN bus data from OEM modules. Common Situations That Trigger This Code BCM firmware mismatch; Wiring issues; Faulty module. What Will NOT Fix This Code Replacing unrelated sensors; Ignoring CAN bus alert. How to Clear This Code on Vehicles Inspect BCM and wiring; clear via Techstream. Related Manufacturer Specific Codes Toyota U1400; Toyota U1402 Previous Next

GM U1202 Code – Sensor/Module Timeout Limited Safe to drive : GM 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 GM U1202 appears when BCM detects data timeout from sensors or modules. What This Code means on the Vehicles Sensor/module timeout on Class 2 network, GM-specific. Why This is different from a generic OBD2 Code Not visible on standard OBD-II scanners. Common Situations That Trigger This Code Wiring harness issues; Faulty sensors; BCM failure. What Will NOT Fix This Code Ignoring timeout; Replacing unrelated components. How to Clear This Code on Vehicles Check wiring, sensor, and BCM; clear via OEM/Tech2. Related Manufacturer Specific Codes GM U1200; GM U1201 Previous Next

BMW P2402 Code – EVAP Purge Valve Fault 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 P2402 occurs when EVAP purge control valve circuit detects fault. What This Code means on the Vehicles BMW-specific purge valve control fault. Why This is different from a generic OBD2 Code Generic scanners report EVAP valve fault but not BMW-specific circuit logic. Common Situations That Trigger This Code Faulty purge valve; Wiring issue; PCM communication error. What Will NOT Fix This Code Replacing unrelated parts; Ignoring valve wiring. How to Clear This Code on Vehicles Inspect purge valve and wiring; clear code via ISTA. Related Manufacturer Specific Codes BMW P2400; BMW P2401 Previous Next

Toyota U1400 Code – CAN Bus BCM 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 Toyota U1400 occurs when CAN bus loses communication with body control module. What This Code means on the Vehicles Indicates body control module is not responding over CAN network, Toyota-specific. Why This is different from a generic OBD2 Code Generic scanners cannot detect CAN bus-specific OEM module errors. Common Situations That Trigger This Code Wiring harness issues; BCM failure; Aftermarket interference. What Will NOT Fix This Code Clearing code without repairing BCM or wiring. How to Clear This Code on Vehicles Inspect wiring and BCM; clear using Techstream. Related Manufacturer Specific Codes Toyota U1401; Toyota U1402 Previous Next