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Emissions. W124 E320 failing NOx
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04-28-2010, 12:34 AM
macdrone
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Join Date: May 2009
Posts: 398
Since most benz motors are made to run on premium grade I would suggest running it yes. You can run lower grade gas but not supposed to.
I second the O2 sensor.
How old is the coil? maybe worth a shot better spark never hurt.
macdrone
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