Ive got an '86 560SEL. It's had rough idle since I bouhgt it . I paid for some diagnostics at the dealer's and they suggested new injectors. I changed them, the car ran better, started much better and the idle improved.

Then the Oxygen sensor light came on. I figured it was time to change the sensor anyway. I got a new one put in. Now the idle is much rougher than ever AND the sensor light is still on. Any ideas?

Thanks

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Martin