Sweet smell inside the car: coolant, and where it leaks from
A sweet, slightly syrupy smell in the cabin is coolant, and the most likely source is a component behind the dashboard that is expensive to reach.
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Blog
Ticking at idle: injectors, lifters or an exhaust leak
Some ticking is entirely normal and some means an engine is running out of oil pressure. The difference is in how the noise responds to temperature and revs.
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Toyota C-HR and Yaris Cross: hybrid diagnostics for the newer range
Toyota hybrid hardware in crossover bodies. What generic OBD-II reaches, what it does not, and the two checks that matter most.
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Toyota Yaris and Aygo: small Toyotas and what actually goes wrong
Two of the more reliable small cars on the market, which changes what a diagnostic article is for: mostly confirming that nothing is wrong.
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Traction control cutting in on dry roads: a sensor, not the weather
The lamp flickers and the engine cuts power on a dry straight road. The system is not malfunctioning — it is reacting to data that is wrong.
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Two-trip logic: why the lamp waits before it warns you
A fault detected once does not light the lamp. Understanding that delay explains why a problem can exist for days before you hear about it.
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Inner edge tyre wear: geometry, not the tyres
Tyres worn to the cord on the inside while the outside looks new. The tyres are fine — something is holding the wheel at the wrong angle.
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U0073: control module communication bus off — the whole network went quiet
This is not one module failing to answer. It is the network itself shutting down, and the cause is usually one device dragging everything else with it.
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U0109: lost communication with the fuel pump control module
The module that varies pump speed has stopped answering. The car may not start, and the cause is often a connector under the rear of the vehicle.
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U0126: lost communication with the steering angle sensor module
Stability control needs to know where the steering is pointed. Lose that message and several safety systems switch themselves off together.
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U0151: lost communication with the restraints control module
The airbag module has stopped answering, which means nothing can confirm the restraint system will work. That makes this a code with a deadline.
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U0401: invalid data received from ECM — a message that arrived and made no sense
Not a lost connection. The message arrived intact and its contents were implausible, which points somewhere different from a wiring fault.
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