1999 honda fail inspection check engine light is on cde 401 egr valve need cleaning is their any cleaning solution that i can use to pour in gas tank to clean

Code 401 is for a problem with the EGR valve.
Code 449 is for a problem with the vent valve solenoid for the gas tank venting system or EVAP.
You would need a shop manual to get the test procedures for each code.

the egr ports in the intake to the head stop up.

Code 401 is for EGR flow insufficient.
There is a sensor that measures how much exhaust gas goes thru the EGR valve. The sensor could have failed, or the EGR valve may not be working. The sensor and valve would need to be tested.

P1491 = Exhaust Gas Recirculation (EGR) Valve insufficient lift.

P1456 = Evaporative emissions (EVAP) control system leakage (fuel tank system).

Check the EGR valve for a failed vacuum diaphragm. Check the fuel filler cap to make sure it is the correct factory style, has a good check valve and is on tight.

Your 401 code relates to the EGR system, vacuum hose leaks are more common for code setting. Also check vacuum modulator as they are known to faile more often than egr valve. If all check out o.k. and there are no exhaust leaks, suspect e.c.m. (computer) problem.
You may just want to check your gas cap also and make sure there is not any air coming through or it will throw off the sensor. Just a quick cheap check. (You may need to change it)

I had an OBD II 401 code and fixed it by cleaning out the EGR vacuum line in the intake manifold. I removed teh EGR Valve and the set screw below it. i used a rifle cleaning brush and one length of the rod. Then I replaced teh set screw. I started teh engind and let the vacuum **** some carb cleaner through the front port hole. when it was sucking good I replaced teh EGR valve and reset the codes. That fixed it.

The EGR and the lift sensor may look perfect from the outside but the under side of the EGR valve and the EGR passage (small tube) are the REAL WORKING parts.

The carbon inside the EGR passage tube and the underside of the EGR valve must to clean out.

Make sure you has a NEW EGR gasket before you start the job.

It's a 2-3 hours job.

If you do not clean the EGR passage tube the Nox emission will get higher (check you past emission reports).

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.



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.

It could be one or all of 4 sensors. the MAF, the MAP or the idle position sensor or dirty fuel injectors. the fuel injectors can be cleaned with an over the counter fuel injector cleaner bottle that you pour in your tank.If these do not fix it, it will be the EGR valve or a vacuum leak to the EGR. Check the fuel injectors first by buying the cleaning product. then check for vacuum leaks around the Fuel injector housing. Buying some starting fluid and spraying it over the small hoses while the car is running will make the engine stall when the fumes from the starting fluid get into the system. then have it scanned again to more or less tell which sensor it is. it could very well work with the fuel injector cleaner.

it is going to be another problem check the map sensor