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Emission problems nox%level is to high on 4.7 v8 what sensor could it be

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Lambda sensor on exhaust is most commonly at fault - seems to get the worst conditions to run in.

Try this link to test -

http://www.picotech.com/auto/lambda_sensor.html

Posted on Jun 11, 2008

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How to test an EGR on a 2008 Dodge Ram width 4.7 liter v8


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Failing emissions testing due to high NOX (oxides of nitrogen)


I have seen several people posting emissions failures due to high NOX (oxides of nitrogen). Nox is created when the engine's internal combustion temperature gets to high.

Two reasons this can occur is improper coolant levels and a malfunctioning egr system. The egr system injects exhaust gas from the exhaust and uses it to line the cylinder walls.This in turn reduces the combustion chamber size and internal combustion temperatures. Ultimately this reduces the amount of NOX created. These systems functioning properly can be the difference in passing or failing your emissions testing because of high NOX ppm.

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Fail smog test


fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

Dec 06, 2012 | Cars & Trucks

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Fail emission high nox


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Nov 29, 2012 | Chevrolet Suburban Cars & Trucks

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I have a 95 grand jeep cherokee and i have failed 2 emission they say it is a the NOx is to high what would cause that?


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?
Among the potential causes of non-compliant NOx readings are:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

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Oct 09, 2012 | Jeep Cars & Trucks

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I just failed my emissions test due to "High HC"


The simplest thing you could do is inspect the connectors to the sensors. You can also try cleaning the intake and the sensors using carb cleaners or tuner cleaner. Check also for vacuum hoses that may have gone bad or could be loose.

May 31, 2011 | 1999 Isuzu Rodeo

1 Answer

High Nox levels on emmission test


here are the possible causes of high nox levels, Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections.the best advice is to take it to a emission specialist to check it out! good-luck!

Apr 29, 2011 | 1995 Mercury Tracer

1 Answer

Keep failing emissions test due to high no levels. I have replaced the oxygen sensor and do not know what could be causing this problem.


NOX is created when the engine's internal combustion temperature gets to high.In addition to maintaining proper coolant levels.The egr system may be malfunctioning.The egr valve uses spent exhaust gases to line the cylinders walls reducing internal combustion temperature and reducing the amount of NOX produced.

Jun 18, 2010 | Cars & Trucks

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

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