NOx is too little air and too much fuel so a blocked egr tube could be in question. Any gas or diesel car Ive seen has an egr system on it...

he doesnt have a problem with HC..... he has a problem with NOx.Whenever you have high NOx hydrocarbons and carbon monoxide are down greatly.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

This engine does not have an EGR.

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Why is my X11 reading 69.2% and not 70%?





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Fuel pressure looks dead on.
Lower Chamber:

Upper Chamber:

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

your egr is mounted on the exhaust manifold and a switch overvalve is mounted on the wall. Ill take a picture for you. every car has a system in place to do the role of egr whether its mechincal or electrical(electrical egr, variabl valve timing(vvti) like in a lexus/toyota.

60% is road speed at ke control unit is an implausible-test hall effect sensor

70% is no tna signal plauisble, open circuit to ke control unit-test tna signal

btw you are supposed to do that after reading the fault memory @ x11/4

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)