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6.4L Performance Parts Discussion What has or has not worked for you?

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Old 04-08-2013, 05:46 PM
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Check Engine Light

I'm new to the diesel world, and I own a 2008 6.4l. I have a full K&N cold air intake, MBRP exhaust (non-race application), and a Hypertech Max Energy tuner. The problem I'm having is that a check engine light frequently comes on. Took it to a local Ford dealer, and their assessment was that the aftermarket exhaust does not create enough back pressure and trips the sensor. Everything else with the truck is fine, it regens regularly. There only suggestion was to put the stock exhaust back on the truck to keep the sensor from tripping. I really didn't want to do that, so I went to a local diesel shop, and I was given three options: 1) put the stock exhaust back on 2) put full race applications on my truck, only if I could prove it was for racing only and 3) they would sell me the parts I needed and I could do it myself. I was also told by the diesel shop that I could leave my truck as is and live with the check engine light coming on periodically and there wouldn't be any issues regarding the particulate filter since it regens regularly. I really don't want to have to spend the extra money if I don't have to. Any help/suggestions would be greatly appreciated. Thanks.
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Old 04-08-2013, 05:49 PM
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Truck runs great with and without check engine light. There are no performance issues either way.
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Old 04-08-2013, 05:53 PM
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So you have dpf back exhaust?
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Old 04-08-2013, 05:58 PM
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It's a 4" filter-back exhaust with a 5" tip
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Old 04-08-2013, 06:02 PM
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Did you have to remove a sensor to install it? I can't see that being the problem because even the stock tailpipe section is straight through. The main part of the tailpipe section is the cooling fins.

Last edited by superduty6.4; 04-08-2013 at 06:11 PM.
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Old 04-08-2013, 06:04 PM
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No, all the sensors are still there. I unplugged them from the old exhaust, then plugged them into the new exhaust after installation, just as the directions stated. Maybe the sensor is bad??
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Old 04-08-2013, 06:12 PM
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So how many sensors did you have to unplug and reinstall in the new exhaust? And you said you still have the dpf right?
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Old 04-08-2013, 06:17 PM
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I was one or two sensors, not sure, don't remember, and dfp is still on truck.
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Old 04-08-2013, 06:22 PM
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Well that still seems weird that they say it would be a back pressure issue. Even the stock system after the dpf is straight through. I would think if it was a back pressure issue it would come on all the time

Is there anything in particular that you are always doing at the time that the light comes on or is it just random?
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Old 04-08-2013, 06:27 PM
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It's random. I've notice is coming on during normal driving and also when I step on it to pass someone or get up on the freeway. Weird thing is that it came on three months ago, consistently. Then for three months it never came. Till recently it's been coming on consistently again.
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