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catalytic converter

  1. MC (2006-2011) Accent
    Hello! 1st time posting been lurking for awhile. so i recently purchased a 2010 Accent with 160k miles on it for $900.00 She runs fine as the only owner was my buddies grandmother. Now granted there are a few issues im having fun fixing...mostly weird electrical things but the car was from...
  2. RB (2012-2017) Accent
    For some reason my car keeps popping up with a code. Then it'll just shut off later. Torque app will say it's 65% efficiency, then the code disappears with 150% efficiency. Today it popped the P0420 code with 99.66% efficiency. The engine also sounded rough and horrible. This is a 2013 Hyundai...
  3. SM (2001-2006) Santa Fe
    BqIUWhat symptoms does an exhaust leak produce in an 04 Santa Fe 3.5glsxl?
  4. RB (2012-2017) Accent
    Hi everyone. New here, and I have what may be a dumb question. I'm kinda hoping it is, and that I'm just missing the most obvious thing. I just replaced the catalytic converter and first oxygen sensor on my friend's 2014 Accent sedan with 161,000 miles, and am now in the process of figuring out...
  5. MD (2011-2016) Elantra sedan/coupe
    My check engine light turned on and using my OBD2 i got code P0420 -Catalyst system efficiency below threshold (Bank 1) . I tested my O2 sensors and they are reading fine, Sensor one is jumping between .1 and .9 while O2 sensor 2 is holding steady at around 750 (between 735 -765). The CAT temps...
  6. General Hyundai Non-Model Specific Discussion
    '05 Tuscon V6 coded a misfire in cylinder 5. It previously coded an issue with the o2 sensor in bank 1, sensor 2. I didn't have access to a live scan tool and that sensor is a pita to check with a volt meter so I checked the spark plugs first. The plugs in 1, 3, and 5 had some carbon deposits...
  7. i20 Forum
    hello to all, last night i had engine light turn on , i checked with OBD2, it was "P0420 Catalyst System Efficiency Below Threshold (bank 1)". i cleared it and it did not appear so far. i checked both o2 sensors with ohm meter, both gave 12-13 ohm on the heaters, and continuity is good. i also...
  8. SM (2001-2006) Santa Fe
    2003 Santa Fe, 2.4 4 cyl. I got a P0421 code recently, so I thought I'd take a look at the cat and the O2 sensors to see what was going on, if they could be cleaned, etc. This is what I found: Looks like the top substrate has completely melted. Downstream O2 sensor also looks heat...
  9. GD (2013-2017) Elantra GT
    I've put 154k on my 2014 Elantra GT and the cat after the down pipe is clogged. I have spent a few weeks trying to locate a replacement that I am confident will fit, but haven't been able to. I talked to the parts counter at a dealer I buy from and they confirmed that I have to buy the entire...
  10. LC (2000-2005) Accent
    Hi Guys, im working on a friend Hyundai Accent 2005 the car is not in a good shape the catalytic converter is clogged up she's not rich so i had the idea to cut the catalytic converter but i realise it was a header/cat combination (I don't really know Hyundai model) so my next idea was too...
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