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Failed nox smog - 1996 Ford Thunderbird LX

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NO ppm CA. smog at 15mph too high


NOX is high coolant or engine temps
& egr issues

Lots on the internet to study on exhaust gases
& the reason they fail inspection or are too hi

Mar 26, 2014 | 1995 Dodge Dakota

2 Answers

My 92 ford explorer failed nox on calif smog test, twice. prior to the 2nd test i did a major tuneup and the nox was higher. got any suggestions?


Check your oxygen sensor, idle speed sensor & the idle air sensor your sensors wil effect. the emmision test.

Oct 03, 2017 | 1992 Ford Explorer

1 Answer

1992 toyota camry fail smog test on nox


Check or replace O2 sensor; scanned fault codes in order to know aditially what other sensor could be failed.

Aug 20, 2012 | Toyota Camry Cars & Trucks

1 Answer

1986 Toyota new rebuilt motor won't pass smog at


It depends which emission you are failing on but I suspect that it is either CO or NOx. If it is NOx, then it is quite possible that you have a problem with your EGR valve or the ignition timing is incorrect. If you failed CO, you may have a dirty air filter or indeed, a bad carb, but I would need to know the actual gas and readings to be certain.

Jun 09, 2011 | 1986 Toyota Pickup 4WD

1 Answer

High nox fail smog test any remedies? 99


NOX is created when the internal combustion temperature gets to high.The egr system uses burnt exhaust gases to line to cylinder walls.The purpose of this is decrease internal combustion temperature therefore reducing the amount of NOX created.Would look to a possible egr malfunction usually they will trigger the check engine light but not always.The 4.3L has been known to have issues with carbon buil up in the egr and the egr pintle not open and closing properly.

Jun 07, 2010 | 1999 Chevrolet Astro

1 Answer

Failed smog


means that the hc,co2,nox, emissions are too high, you will need the numbers in ppm on the read out to begin diagnossis

May 08, 2010 | 1995 Oldsmobile Aurora

1 Answer

02 kia fail smog high nox


if the engine computer says that you have a slow O2 sensor what it means is that the sensor does not react as quickly as it should and it needs to be replaced. nox is oxides of nitrogen, a product of too lean combustion which causes cylinder temps to go too high. it sounds like replacing O2 sensor will make it happy. engine computer is having a hard time controlling lean/ rich fuel mix because sensor is slow to register changes, needs to have response time in milliseconds or engine computer can't operate properly. O2 sensors do wear out, normal service item. hope that helps

Jun 17, 2009 | 2002 Kia Optima

1 Answer

Failed smog


We had to have the calatic converter replaced. We did this after doing an oil change, air filter change, and new spark plugs and still hadn't passed smog. After changing the calatic converter it passed smog with scores of 25.

Mar 17, 2009 | 1992 Mazda Protege

1 Answer

CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.


nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Oct 24, 2008 | 1993 Chevrolet Suburban

1 Answer

2001 Sonata V6, Smog failed - high NOX


if i were you i would contact cragen and ask them if the car has it and how much the replacement part is

Aug 19, 2008 | 2001 Hyundai Sonata

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