Common OBD2 Fault Codes
Detailed deep-dives for the most common engine fault codes on Indian vehicles — symptoms, causes, multimeter testing specs, and step-by-step repair guides.
These 11 codes are what we demonstrate on the web. The VahanScan app ships the full 1000+ code offline library (standard SAE J2012 + OEM-specific) that works without internet in any garage.
O2 Sensor Circuit Malfunction (Bank 1, Sensor 1)
O2 Sensor & Silencer • Bike / Car / Auto
Random / Multiple Cylinder Misfire Detected
Spark Plug & HT Coil • Car / Truck / Bike
SCR NOx Catalyst Efficiency Below Threshold (Bank 1)
DPF, SCR & AdBlue (DEF) • Truck / Car
Throttle Position Sensor (TPS) Circuit Low Input
Throttle (TPS) & Air (MAP) • Bike / Car / Auto
Engine Coolant / Oil Temp Sensor Circuit Malfunction
Engine Temp (ECT/EOT) • Bike / Car / Truck / Auto
Fuel Rail / System Pressure Too Low
Fuel Injection & Pump • Car / Truck / Bike
Catalytic Converter System Efficiency Below Threshold (Bank 1)
O2 Sensor & Silencer • Car / Bike / Auto
Lost Communication with Engine Control Module (ECM / ECU)
ECU & CAN Bus / J1939 • Car / Truck / Bike / Auto
Left Front Wheel Speed Sensor Circuit Malfunction
ABS, ESP & Braking • Car / Truck / Bike
System Voltage Low (Charging System Under-voltage)
Battery & Alternator/RR • Bike / Car / Truck / Auto
Evaporative Emission (EVAP) Purge Control Valve Circuit
EVAP & Purge Valve • Car / Bike / Auto
The full 1000+ code offline DTC library lives inside the VahanScan app.
Standard SAE J2012 + OEM-specific codes, with Hindi voice guidance — no internet needed.