Aygo running rich

I'm experiencing a problem with my 2012 Toyota Aygo, gasoline engine. Mileage is 95306 km. The engine seems to be running too rich. Symptoms include reduced engine power, the check engine light illuminating, rough engine running, higher fuel consumption, and jerking when accelerating. Could a defective injection valve/injector be the cause?

4 comment(s)

Hey there! I had similar symptoms with my Toyota Aygo, though I'm not sure about the year. Have you checked your air filter recently? A clogged filter can definitely mess with your fuel economy. Also, what about the oxygen sensor? A faulty one could be sending incorrect data to the engine's computer, causing it to inject too much fuel. Ever thought about taking a look at the intake manifold?

Thank you for your suggestions. I have not yet checked the oxygen sensor, but I replaced the air filter recently. Can you elaborate on why you think the intake manifold could be the issue?

Well, a leak in the intake manifold could cause unmetered air to enter the engine, which throws off the air-fuel ratio and makes it run rich. Though, honestly, with those symptoms, it does sound like it could be the injectors themselves. Have you considered getting it checked by a workshop? It might save you time and money in the long run, rather than chasing down all these potential issues yourself.

Understood. I appreciate your input. I have taken the car to a workshop. Indeed, the injection valve/injector was defective. The repair cost 515€.

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