How to Clean a Honda Passport EGR Valve

Written by leonardo r. grabkowski
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How to Clean a Honda Passport EGR Valve
EGR valve location is the same for both Passport engines. (,,,,,,

EGR (exhaust gas recirculation) valves have been used in vehicles since the 1970s to combat harmful emissions from automobile engines. The EGR valve's main job is to reduce nitrogen oxide. Many people mistake a bad EGR valve for a dirty EGR valve, often spending hundreds of dollars for a replacement. EGR valves rarely fail; however, they frequently become clogged with carbon build-up, which renders the valve useless. A non-functional EGR valve will always result in a "check engine" light. Clean your EGR valve before spending money to replace it.

Skill level:
Moderately Challenging

Things you need

  • Pliers
  • Socket wrench set
  • Hand towels
  • Q-tips
  • Carbon cleaner
  • Replacement gasket

Show MoreHide


  1. 1

    Turn the engine off and let it cool for at least 30 minutes. You will be working near major engine components to remove the EGR valve, so let the engine cool to avoid burns. Disconnect the negative battery cable before beginning the procedure.

    How to Clean a Honda Passport EGR Valve
    Disconnect the negative battery cable for safety.
  2. 2

    Locate the EGR valve on your Passport. The Passport EGR valve is located in the rear of the engine bay on the driver's side in both the V-6 and four-cylinder engines. Disconnect the vacuum lines attached to the EGR valve. They can be pulled off with your hands.

    How to Clean a Honda Passport EGR Valve
    Typical EGR valve
  3. 3

    Remove the three bolts mounting the EGR valve in place. The two on top are very easy to access. Use a standard socket wrench to remove them. The last bolt is tough to reach, because of the small space. Have someone with small hands help you if you have a difficult time accessing it.

    How to Clean a Honda Passport EGR Valve
    Use a socket wrench to remove the EGR valve.
  4. 4

    Remove the EGR valve once the bolts are removed. Make sure you remove the gasket between the valve and its mount. The gasket cannot be reused. Carefully scrape the gasket off if it is stuck to the mount.

    How to Clean a Honda Passport EGR Valve
    Similar gasket shown. EGR valve gaskets have two holes.
  5. 5

    Bring the EGR valve to a well-lit workspace. Use the carbon cleaner to thoroughly clean the EGR valve. Open both valves and spray the cleaner inside; use the hand towel and the carbon cleaner to remove all of the build-up. Spray carbon cleaner into both vacuum holes. Insert a Q-tip to clean the vacuum holes. If there is a lot of carbon build-up, you will need several Q-tips and several hand towels.

    How to Clean a Honda Passport EGR Valve
    Carbon build-up keeps your EGR valve from working properly.
  6. 6

    Wipe the EGR valve dry. Attach the new gasket along with the EGR valve. Replace the mounting bolts and reattach the vacuum lines with your hands.

    How to Clean a Honda Passport EGR Valve
    Always replace the EGR gasket when reinstalling the valve.

Tips and warnings

  • Use an extended handle socket wrench, or a wrench with an adjustable head, to make reaching the third bolt easier.
  • Only purchase a carbon cleaner labelled "safe for catalytic converters". Others will damage your catalytic converter, which is very expensive to replace.

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