Question about Honda Accord

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My 1992 honda accord failed emissions just on oxide nitrogen the standard is 2.50 and mine was 2.52.what do i have to do to fix problem to make it pass.

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Engine Temp?
Thermostat or Coolant sensor

Vacuum Leaks

Egr Valve

Ignition Misfires

Bad converter

O2 Sensors

Need to have the entire engine checked
for proper operation

Posted on Apr 06, 2011


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'09 wrx obd codes P2200 and P3700....what do they mean?

P2200 = nitrogen oxide sensor bank 1.
P3700... no clue. Probably related to P2200, but manufacturer-specific.

That's an '09. This is an emissions issue. Your vehicle is covered by an emissions warranty until the year 2019. Use that warranty, don't pay to get this fixed.

Jul 31, 2014 | Cars & Trucks


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.

on Jun 18, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

Not passing emissions

The NOx (Oxide of Nitrogen) level standard in the state of New Jersey is 1372. Anything higher than this number will fail emissions.
vas 5054a v19

Dec 19, 2012 | 2008 Chevrolet Suburban

1 Answer

Sometimes hard to start, then when driving the car will lurch and wants to die

its your catalytic converter (colloquially, "cat" or "catcon") is a vehicle emissions control device which converts toxic byproducts of combustion in the exhaust of an internal combustion engine to less toxic substances by way of catalysed chemical reactions. The specific reactions vary with the type of catalyst installed. Most present-day vehicles that run on gasoline are fitted with a "three way" converter, so named because it converts the three main pollutants in automobile exhaust: an oxidizing reaction converts carbon monoxide (CO) and unburned hydrocarbons (HC) to CO2 and water vapour, and a reduction reaction converts oxides of nitrogen (NOx) to produce CO2, nitrogen (N2), and water (H2O).[1] The first widespread introduction of catalytic converters was in the United States market, where 1975 model year gasoline-powered automobiles were so equipped to comply with tightening U.S. Environmental Protection Agency regulations on automobile exhaust emissions.[2][3][4][5] These were "two-way" converters which combined carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide (CO2) and water (H2O). Two-way catalytic converters of this type are now considered obsolete, having been supplanted except on lean burn engines[citation needed] by "three-way" converters which also reduce oxides of nitrogen (NOx).[2]
Catalytic converters are still most commonly used in exhaust systems in automobiles, but are also used on generator sets, forklifts, mining equipment, trucks, buses, locomotives, motorcycles, airplanes and other engine-fitted devices. They are also used on some wood stoves to control emissions.[6] This is usually in response to government regulation, either through direct environmental regulation or through health and safety regulations.
Catalytic oxidization is also used, but for the purpose of safe, flameless generation of heat rather than destruction of pollutants, in catalytic heaters.

Oct 15, 2012 | 1995 Buick LeSabre

1 Answer

My 1995 Nissan pick up truck failed the emission test from NOx oxides of nitrogen. The standard is 3.00 mine was 3.26, what could be the problem, is it the EGR valve?

NOX is formed from high pressure and temperature above 2500 degrees. The job of the egr is to recirculate exaust back into the cylinder to give it a cooler charge (exhaust wont burn). Make sure your cooling system is up to par and clean your egr with some carb cleaner and make sure the passages are clear. egr valves and passages get very dirty

Sep 08, 2011 | Nissan Pickup Cars & Trucks

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Engine light and maitenance required light came on. I went to place and had them run a check. It read the CO2 is blocked or clogged. They said I needed to take it to a shop and get my emisson line cleaned...

It would help to know what the fault code was, but i suspect the EGR valve is the problem in regards to the carbon dixode. The EGR valve works by routing a small amount of exhaust back into the combustion chamber. When the temperature in the combustion chamber is too high, nitrogen oxides are produced, which combine with elements in the atmosphere to form smog. Introducing a small amount of exhaust into the system reduces the temperature in the combustion chamber, reducing the amount of nitrogen oxides produced...I hope this helps.

Aug 25, 2011 | 2004 Honda Accord

1 Answer

Vehicle takes 5 minutes to idle by itself. Why?

An inadequate functioning egr system.The exhaust gas recirculation valve uses spent exhaust gases to line the cylinder walls with burnt gases.The purpose of this is to keep the cylinder temperature lower to reduce emissions of oxides of nitrogen.

Jun 01, 2010 | 1990 Pontiac Trans Sport

1 Answer


if it's slightly above the limit.. you could try putting in premium gas or an octane additive as that will lower your emissions slightly..

Sep 11, 2009 | 1992 Honda Accord

1 Answer

My car failed emissions oxides of nitrogen was a 5.74

Catalytic converter problem? Usually it takes most of the harmful impurities out before leaving your exaust system. $

May 21, 2009 | 1993 Mazda MX-3

2 Answers


The most likely cause of this is a faulty exhuast recirculation system.It is used to cool the combustion process preventing the formation of nitrous oxide emissions. The main building block of acidic rain.Use your emission diagram and locate the EGR valve.You will need specialized equipment to check it. Other than taking it off and checking for blocked passages from carbon build up there is little you can do yourself.

Dec 31, 2008 | 1995 Ford Contour

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