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 > Ford knox sensor

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ACZL

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Posted: 10/09/19 07:44am Link  |  Quote  |  Print  |  Notify Moderator

Have other folks had issues w/ Fords Knox sensors? If so, did your dealer tell you why it failed or triggered a engine light? Mine is telling me it's being tripped by using aftermarket fuel additives which I find hard to believe. If that's the case, what are we supposed to do to prevent gelling in winter months?


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DownTheAvenue

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Posted: 10/09/19 08:03am Link  |  Quote  |  Print  |  Notify Moderator

Stop using the aftermarket fuel additives. You are told why your check engine light comes on. Diesel fuel already is formulated to prevent gelling right out of the pump. Isn't science amazing?

mleekamp

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Posted: 10/09/19 08:11am Link  |  Quote  |  Print  |  Notify Moderator

....and by the way, it's a Knock Sensor, not Knox


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ACZL

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Posted: 10/09/19 08:19am Link  |  Quote  |  Print  |  Notify Moderator

mleekamp wrote:

....and by the way, it's a Knock Sensor, not Knox


That's what's printed on repair order and it's related to emission system so IMO I really think it's supposed to be nox , but again that's what's written down on paper I was given.

ACZL

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Posted: 10/09/19 08:21am Link  |  Quote  |  Print  |  Notify Moderator

DownTheAvenue wrote:

Stop using the aftermarket fuel additives. You are told why your check engine light comes on. Diesel fuel already is formulated to prevent gelling right out of the pump. Isn't science amazing?


Try telling that to folks in areas where temps get down to -30 to -20.

ShinerBock

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Posted: 10/09/19 08:21am Link  |  Quote  |  Print  |  Notify Moderator

The are knock sensors and a NOx sensors. Which one are you referring too? I am guessing since it is a diesel in your sig that you are referring to the NOx sensor.

ShinerBock

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Posted: 10/09/19 08:35am Link  |  Quote  |  Print  |  Notify Moderator

ACZL, if it is a NOx sensor that your are referring to then yes aftermarket fuel additives could be the culprit. NOx is created when in cylinder temps get above 2,800F which a diesel engine normally does. To combat this, two things may happen. One, the EGR valve will open introducing cooled exhaust gas back into the intake to cool the in cylinder temps down. Two, if the SCR catalyst is hot enough, the system will inject more DEF if the NOx sensors detect more NOx downstream from the DPF.

You have NOx sensors at various parts in the exhaust/emissions system, and a fuel additive may alter NOx level. So basically what is happening is the ECM is triggering the EGR and SCR to combat the NOx being created, but the fuel additive may be making the engine run more efficient creating more NOx(yeah, an oxymoron). This will trigger a CEL because the engine is doing what it is programmed to in order to reduce NOx, but the amount is still not coming down to normal levels due to the fuel additive.

NOx and emissions devices is the real reason why diesel makes don't recommend additives anymore even though they want the best fuel possible ran through their engine and they do make them run more efficiently. If they recommend a fuel additive that increased NOx output or damages emissions equipment, then they could be liable.

FishOnOne

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Posted: 10/09/19 09:27am Link  |  Quote  |  Print  |  Notify Moderator

It was most likely a Nox sensor. Mine failed at around 110k miles and I don’t run additives.


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Turtle n Peeps

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Posted: 10/09/19 09:30am Link  |  Quote  |  Print  |  Notify Moderator

mleekamp wrote:

....and by the way, it's a Knock Sensor, not Knox


No such thing in a diesel.

There is a NOx sensor and yes, additives can cause problems as Shiner has already said.


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Lynnmor

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Posted: 10/09/19 02:31pm Link  |  Quote  |  Print  |  Notify Moderator

Maybe the dealer wants to charge you an amount that will require robbing Fort Knox. [emoticon]





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