C0035 to C0050: wheel speed sensor codes by corner
The code names the corner, which means the diagnosis starts at one wheel instead of four. Everything after that is inspection rather than deduction.
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C0051: steering wheel position sensor and the calibration it needs
Half of these are not faults at all — they are a sensor that was never told where straight ahead is after somebody worked on the car.
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C1241: low or high battery voltage seen by the ABS module
An ABS code that is not about ABS. The module is reporting a supply problem, and the fix is at the battery rather than the brakes.
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Heater warm on one side only: blend door or airlock
Hot air from one vent and cold from another means a flap is stuck or the matrix is not getting full flow. Two causes, two very different repairs.
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The 60 ohm test: checking CAN bus termination with a multimeter
One measurement, two wires, thirty seconds. It tells you whether the vehicle network is physically intact before you diagnose a single module.
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Alarm triggering by itself: how to find which sensor did it
Most alarm systems record what triggered them. Reading that record turns a neighbourhood nuisance into a specific repair.
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Car pulls under braking: caliper, hose or contamination
Pulling only when you brake is a different fault from pulling all the time, and it is a safety issue rather than an annoyance.
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Starts then dies within seconds: immobiliser, fuel or idle control
An engine that fires and stops within two seconds is telling you something specific, and the timing narrows the cause more than any code.
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Will not rev past 3000 rpm: limp mode with a specific cause
A hard ceiling on engine speed is not the engine running out of breath. It is the ECU imposing a limit, and the reason is stored in the code memory.
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Chery Tiggo: the platform under several badges
The Tiggo underpins Omoda, Jaecoo and others. Knowing that means the documentation you need may be under a different name.
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Citroen C3 and C5 Aircross: the same engines, different priorities
Stellantis engines in Citroen bodies. The mechanical checks are shared with Peugeot; the suspension and comfort systems are where they differ.
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Clunk when you brake: caliper hardware, mounts or a worn joint
A single knock as you apply the brakes, and another as you release. That pattern means something is moving in its mounting when the load reverses.
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