Check engine light on with cod
spn 656 fmi 7 cummins
also im getting bad mpg
code. spn 656 fmi 7 cummins
Discussion in 'Volvo Forum' started by Roman78, Nov 6, 2021.
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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.
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It’s safe to drive. I’ve used a diesel supplement for maintenance.
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