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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   1989 toyota pickup 3.0 crank no start I have a 1989 toyota pickup 3.0 crank no...   Strut spring orientation and strut mount tension nut 2017 Nissan rogue awd 2.5 L Put in Monro...   Transmission stuck in part, I have tried everything So I'm working on my elderly fathers 201...   2017 dodge journey LED headlights on/off randomly Year of vehicle 2017 Make of vehicle dod...   Kia Soul starter replacement issues! Okay so my car is a 2010 Kia soul 2.0 en...   Please Help - Knock sound & engine fail Hi all, Hoping to get some insight and ...   multiple warning lights 2013 GMC Terrain 130,000 miles 4 cylinde...   03 alero no low speed blower Good day everyone, I have a 2003 Olds a...   04 Chevy 2500hd tail light issues Help!!! I have changed my combo switch...   1999 Grand Caravan Sport not starting. Hi. I'm new here. I hope someone can hel...

Check engine Light trouble Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting Sjacket01 Anonymous Poster sjacket01@yahoo.com Mar 4, 2009, 10:02 AM Post #1 of 5 (2531 views) Check engine Light trouble Sign In My check engine light came on so I took it to Autozone to get it checked and they can't find the plugin of the check engine scanner. Any help is appreciated. 2001 Hyundai Sonata 4 cylinder 80k miles Double J Veteran / Moderator Mar 4, 2009, 10:07 AM Post #2 of 5 (2525 views) Re: Check engine Light trouble Sign In Show 'em this. Guest Anonymous Poster Mar 4, 2009, 10:50 AM Post #3 of 5 (2521 views) Re: Check engine Light trouble Sign In I found and showed them where it was thanks. I got the codes P0304 and P0421. The print out they gave me didn't even list hyundai. Any ideas what those could be? Double J Veteran / Moderator Mar 4, 2009, 12:13 PM Post #4 of 5 (2511 views) Re: Check engine Light trouble Sign In P0304 is a misfire detected on number 4 cylinder P0421 is a oxygen sensor code (Rear sensor) Find and correct the engine misfire code first.(A must) May take care of the 02 sensor code. Possible causes of the second code are a faulty 02 sensor (Rear),faulty catalytic converter ,Engine control module(ECM),exhaust leaks,Engine misfires......Get the idea... sjacket01 Anonymous Poster sjacket01@yahoo.com Mar 25, 2009, 4:19 AM Post #5 of 5 (2479 views) Re: Check engine Light trouble Sign In Replaced spark plugs and 304 error was fixed. Replaced catalytic converter and it fixed the problem I was having but check engine lght came on again with same 421 code. I'm guessing it's the O2 sensor now.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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