Discussion in 'Volvo Forum' started by Roman78, Nov 6, 2021.
Check engine light on with cod
spn 656 fmi 7 cummins
also im getting bad mpg
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I get the same code, it comes and goes. I think there called ghost codes. My mileage sucks to, the best I’ve ever gotten out of my isx 15 is 6.8 and was running lite. When I’m heavy, 5.5.
Is it safe to drive on t. Will fuel injector cleaning help. Thanks alot
It’s safe to drive. I’ve used a diesel supplement for maintenance.