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Codes

Tiny
LALFAN
  • MEMBER
  • 179 POSTS
The light came on in the car again. The 421 code. I had the guy at work use the scanner. It had no misfires. No back pressure and no leaks. Always seems to run good when light comes on. He said dont worry about that code. Just dont like the light being on. He had all the info from the car. So I guess for some reason my scanner cant get all the info from the car.
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Wednesday, April 6th, 2011 AT 10:56 PM
Tiny
SATURNTECH9
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I had a feeling it was probably your scanner just not showing the lines of data that's why I said I wouldn't go down the road of replacing ecm because of that. As far as a low effecientcy cat you can drive it like that you will just have to take care of that before your smog is due. Have you ran thru the trouble tree to see if it was a bad cat?
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Thursday, April 7th, 2011 AT 6:45 PM
Tiny
LALFAN
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I had the 421 code so that should be the front bank. I have no misfires. I dont know of any leaks. If a sensor is bad it should give me a code? The dia gram wont load on my computer right now. So it should be a bad sensor front bank or a bad cat? We dont have smog tests here.
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Thursday, April 7th, 2011 AT 9:51 PM
Tiny
SATURNTECH9
  • MECHANIC
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Yeah you look for leaks and that the front o2 sensor is working correctly it will usually set a code if it isn't. Also look for leaks if there isn't and no miss fire's then bad cat. If you don't have smog checks then there really isn't any worries there. Only problem is the light will stay on and you won't know if you get any other problems because the light will already be on.
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Friday, April 8th, 2011 AT 1:29 AM

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