{"id":81635,"date":"2024-05-27T09:53:58","date_gmt":"2024-05-27T16:53:58","guid":{"rendered":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=81635"},"modified":"2024-05-27T09:54:00","modified_gmt":"2024-05-27T16:54:00","slug":"1999-honda-accord-uses-more-gas-now-that-the-check-engine-light-is-on","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2024\/05\/1999-honda-accord-uses-more-gas-now-that-the-check-engine-light-is-on","title":{"rendered":"1999 Honda Accord uses more gas now that the check engine light is on"},"content":{"rendered":"\n

hi i have a hond accord from 1999 2l vtec engine. i have a chekengine that dous not go away. the first lambda voltage dous not change much 0.6v to 0.7v, the second lambda after cat dous varie wildly even when wharm. i have done a smoke test to find cracks\/leaks, compression test was fine too. changed fuel filter and pump and both lambdas originals from honda. injectors seem fine to. The car drives normally, power is normal but i use a bit more gas then before the checkengine appeared.
the car has about 150000 km<\/p>\n\n\n\n

\n\n\n\n

Posting the check engine light code (ex. p0442) would be VERY useful in giving you accurate advice. <\/p>\n\n\n\n

That being said, if the Air\/Fuel Sensors (lambdas\/ho2s sensors<\/a>) stick, they can send a false signal causing excessive fuel mileage. But in general when the check engine light illuminates the engines computer receives a signal at the same time to use preset parameters in place of the once fluctuating signals. This in turn will cause higher fuel mileage until the repairs are made. <\/p>\n\n\n\n

DRIVE CYCLE – AIR FUEL (A\/F) RATIO SENSOR MONITOR – ACCORD, ALL 4-CYLINDER ENGINES<\/h2>\n\n\n\n

Notes:<\/p>\n\n\n\n

    \n
  1. If DTCs are erased, or power to the ECM interrupted, the readiness monitors will be set to Incomplete.<\/li>\n\n\n\n
  2. Do not turn ignition switch OFF during procedure.<\/li>\n<\/ol>\n\n\n\n

    Conditions:<\/p>\n\n\n\n

      \n
    1. Ambient temperature 20-95 degrees F.
      Steps:<\/li>\n\n\n\n
    2. To check if readiness codes are set, turn the ignition switch ON, but do not start the engine. The MIL will come ON for 15-20 seconds. If it goes OFF, readiness codes are set. If it blinks, readiness codes are not set.<\/li>\n\n\n\n
    3. Connect scan tool.<\/li>\n\n\n\n
    4. Start the engine and run it at 3000 rpm under no load in P or N, until the radiator fan comes ON.<\/li>\n\n\n\n
    5. Let the engine idle for 5 seconds.<\/li>\n\n\n\n
    6. Drive at a steady speed between 50-62 mph with A\/T in D4 or M\/T in 5th gear for 2 minutes.<\/li>\n\n\n\n
    7. With A\/T in D4 or M\/T in 5th gear, decelerate from 62 mph by completely releasing the throttle for at least 5 seconds. If the engine is stopped during this step, go back to Step 4 and start over.<\/li>\n\n\n\n
    8. Check the readiness status of the monitor with a scan tool.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

      hi i have a hond accord from 1999 2l vtec engine. i have a chekengine that dous not go away. the first lambda voltage dous not change much 0.6v to 0.7v, the second lambda after cat dous varie wildly even when wharm. i have done a smoke test to find cracks\/leaks, compression test was fine… Read More »1999 Honda Accord uses more gas now that the check engine light is on<\/span><\/a><\/p>\n","protected":false},"author":23059,"featured_media":52377,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[1,4],"tags":[],"class_list":["post-81635","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-auto-repair-questions","category-honda"],"yoast_head":"\n1999 Honda Accord uses more gas now that the check engine light is on - FreeAutoMechanic Advice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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