Question about 1993 Honda Accord

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Failed emission NOx on a 93 Honda accord ex its papes the 25/25 test but not the 50/50 test. what is wrong how do I fix this? check engine light stays on?

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The only thing I can think of checking would be the EGR valve, a faulty cat converter or faulty o2 sensor. Converter shouldn't set off check engine light though unless it is clogged causing too much back pressure, most likely EGR Valve.

Posted on Oct 02, 2009

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2 Answers

Why would my car not pass Georgia Emissions testing?


Can you remember how many miles you have driven since the engine was installed? What I mean is that if you have a good running engine and have a new converter, sometimes the easiest things are the ones overlooked. Check your air filter to make sure it isn't dirty and restricting air flow. Also check your spark plugs to see what kind of shape they are in and if they are burning clean. Spark plugs can tell a lot. If you had transfered any emission related parts from the old engine to the new, maybe one of those items has an issue or is clogged. I hope this helps. Good luck.

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I failed Emissions Test: 15mph: HC - (max 66) 150


go to autozone and have them look and the check engine light and that will help you figure it out. they should also give you a piece of paper that will tell you what is wrong take that to an auto mechanic and ask his opinion

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My 1989 Mercedes 260E has no EGR valve and CA emission test failed NOX. What's next?


You engine came with EGR, here is a picture of it, make sure it is functional.808daddd-23be-456e-979e-50a2188da73b.jpg

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1992 honda accord ex. nox on emissions test too high..what could solve this problem


I cant tell you to do this.. But if you add about 3-4 ounces of acetone to your tank of gas it should go threw. They sell a version of this in autozone. Ask the guy at the counter, hell show you where. Acetone is the home version of this, and CAN but has not been proven to harm sensors. I have done it with cars that had a bad catalystic converter and passed.

Aug 25, 2010 | 1992 Honda Accord

1 Answer

1994 honda accord failed its emisions test.


i would say change the O2 sensors and a new cat ,these readings are well over the top ,could have a exhaust blow on exhaust as well which will throw out the O2 readings

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1 Answer

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Sticking egr will raise everything except nox. Bad o2 bad cat hard to give an accurate diagnosis with out checking it

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Check engine light comes on and off, auto zone test read back EGR flow insufficient/manufact.specif.DTC/see service manual.what does any of that mean?HONDA ACCORD 4CYL.2001


The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. When the EGR valve goes bad, it must be replaced.

The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recirculates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up. You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on acceleration.

Here is a picture of where the EGR Valve is located (Accord 1999). Replacing it is fairly simple and straightforward. A vacuum line and a couple of bolts. You'll see what you have to do when you look at it.

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If you are replacing the EGR Valve due to the Check Engine Light (MIL) being on with a DTC P0401 then I suggest contacting your Honda Dealer. There was a Product Update Campaign (PUD) in the fall of 1999 that corrected the problem.

Another times, the clean is the solution...I hope help yoiu with this. Good luck, and remember rated this help.

Sep 03, 2009 | 2001 Honda Accord

1 Answer

Check Engine light


try not to use high test gas. see what happens. sometime it can cause a ping in the engine and the knock sensor will pick it up and throw a code. let us know. try this first

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1 Answer

My 1992 Cutlass Supreme SL Olds failed emissions.


High NOX readings indicate a somewhat lean condition IE: hot exhaust. Possible causes are cracked and leaking vacuum lines or lazy oxygen sensors. If possible have a reputable garage with engine electronics scanner services check the sensor to see if its helping to create the lean condition

Apr 25, 2009 | 1992 Oldsmobile Cutlass Supreme

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