2003 Nissan Xterra "nox high" Questions

engine pinging nox gas to high or bad fuel. octane to low, egr valve not operating..

...high CO GPM readings EGR is for NOX Too Rich a fuel mix is HI CO Are the front or upstream oxygen sensors over 100,000 miles? Air Filter new? Always change oil before inspection & use full ...

high nox fail smog test any remedies? 99 high nox fail smog test any remedies? 99 astro van changed plugs & plug wires ... Van Runs better need to pass smog nox is to high NOX is created when the ...

NOx is to high what would cause that? What causes High NOX EmissionsThousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions.

high Nox what could be wrong? strong fuel smell rich as mechanic tells me and hesitation upon take off from light in 1st gear . i had replaced the Fuel pressure regulator and fuel filter MAF, and soon

...high NOx reading can be caused by any conditions that make the engine run lean. Vacuum leaks will dilute the fuel/air mixture with excess air leading to lean running. Lean mixtures lead to high ...

...HIGH NOX VALUES. WE FAILED THE SMOG TEST BECAUSE OF HIGH NOX. HAS NEVER FAILED BEFORE. 1993 CHEVY SUBURBAN 1500 4X4. COMPLETELY STOCK. WHAT SHOULD I CHECK FIRST. nox is from running lean..... its ...

...ridiculously high nox. It does not have a egr system. Has new cat. How do I get nox down. In California. Thanks. Nox is caused by high combustion temps. A lean mixture runs hot. Check for vacuum ...

...high NOX indicates your engine is running high combustion temps. Two of the major reasons for lean mixtures are intake leaks and clogged fuel injectors. The reason the engine computer cycles between ...

...are to high , this car is listed as a 1998 Altima is this correct? if so why are they testing for nox?High nox readings can be due to engine running hotter than normal or egr system not operating