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I have a 97 Elantra with 310,000 miles and it recently started missing I was thinking it was wires or ignition coil, but then it started dieing on me. Just cut off while drinving. I had the CEL codes pulled and got P0133(o2 sensor), P0422(cat), P0447(evap), P0201(injector 1), P0203(injector 3). Most of these codes seem to be electrical. Do you think it is the ECM?

THANKS!!
 

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I have a 97 Elantra with 310,000 miles and it recently started missing I was thinking it was wires or ignition coil, but then it started dieing on me. Just cut off while drinving. I had the CEL codes pulled and got P0133(o2 sensor), P0422(cat), P0447(evap), P0201(injector 1), P0203(injector 3). Most of these codes seem to be electrical. Do you think it is the ECM?

THANKS!!
More than likely a bad ground or terminal issue. Might want to do the following.
I have the info for the US market through 2000 and will post what you need if you are in the US.

Best practices for requesting help:If you haven't done so fill in your vehicle info and profile page. At upper right corner under the search box click on user cp (it's your control panel)
This info will show up to the left under your user name and is very helpful.
BE SURE TO ADD YOUR LOCATION SO WE KNOW WHAT MARKET YOU ARE IN.



  • Be sure you are in the correct forum for your vehicle.
  • Do a search for your problem. A lot of stuff has been asked and answered.
  • Do not double post for the same problem.
  • Give the model year....Engine size...transmission type (auto or standard)
  • Take a single issue at a time. Posting multiple issues at once will get convoluted very quickly
  • VIN number can be very helpful
  • Vehicle history can be good. How many miles. If not bought new, how many have you put on it.
  • Describe the problem best you can. If a noise can you get a sound or video file
  • Tell us what has been done, if anything, thus far. If tests have been performed give actual results not OK or passed. If scanned for codes the actual code(s) not O2 sensor or MAF, Etc.
  • If the vehicle has been to a repair facility it would be nice if you could post a picture of that invoice/bill
  • If your vehicle is under warranty you should have the dealer check it out. If it's a problem they see many times they will generate a safety recall of TSB. This is how they know of the problem.
This information can save a lot of time and get you the answers you need much faster.


Thanks,
Welcome aboard.
 

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Do this. Start the car and wiggle all of the wiring to and at the top of the engine. You may need to take off the engine cover. We are trying to see if you can isolate a bad connector or wiring issue.
There are two grounds at the right side of engine one on the intake manifold and the other below it. Clean them and tighten back down.
 
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