Q: Mercedes engine is trembling

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HI, The issue started when i parked teh car for some time and once i came back ans started the car my check engine light came up with the O2 Sensor Errors along with throtle actuator, the guy changed the sensors along with the ignition coils the engine light gone but after like for weeks came up again with the same codes,

what possibility could be the cause, now the car is agin in the garage and teh guys are tryingto figure out what actually is the issue

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