A couple weeks ago the engine management light came up on my car which was due to the lambda sensor... but my friend cleared it for me and it hasnt came back on since. But last night the orange light came on (car and a spanner) when I started the car, pushed my foot onto the accelerator but nothing at all, wouldnt even rev! Turned the car off then back on again and it worked fine again, is this something to be worried about?
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