Catalyst monitor fail?

Tiny
ANN SENN
  • MEMBER
  • 2013 HYUNDAI VELOSTER
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Didn't on board monitoring test and there was one fail which was the catalyst monitor I think it read 53 in the minimum is 215 also engine light is on and I'm getting code p0106 the MAP sensor has been replaced so I don't believe that's the problem it is an OEM per. I also did a read of live data and my O2 bank to sensor it's giving out a normal reading not jumping around I think it's 0 455 or 455 something like that. I have to get and eCheck within this next week to get my tags I think it may need a drive cycle done but I'm not sure what all that entails I've tried clearing the code and the engine light still is on I've unplugged the battery it was about an hour it was done and then reconnected still didn't take the engine light off so I need to figure this out quickly. A little background is spark plugs and ignition coils are good recently replaced and like I said the map sensor also cam shaft and crankshaft are fairly new all OEM parts. Also performed a leak down test a while back and cleaned out all the chambers and valves, pistons under the intake manifold. So, drive cycles the only thing I can think of that might be keeping it on there but I can't find exactly for my car how that goes. Thank you for any input you can give me I appreciate it.
Wednesday, June 26th, 2024 AT 10:15 AM

2 Replies

Tiny
ANN SENN
  • MEMBER
  • 49 POSTS
*Did an onboard monitoring test.
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Wednesday, June 26th, 2024 AT 10:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Hi,

Ann, the drive cycle won't turn the light off. There are several monitors that watch what is happening with different circuits. Once the codes are cleared, you must then drive it until the monitors are reset. If the check engine light stays off, you are good to go. The only way to confirm that is with a scan tool to see if it is ready for testing. On the other hand, if the light is still on, there is still a problem.

When you indicated the o2 sensors didn't move as far as voltage, there should be a difference between the up and down-stream sensors. You should see the voltages change when the engine demand changes such as when you hit the throttle. If that isn't happening and both are showing similar readings (sensors 1 and 2) the catalytic converter is likely failing.

Since the catalytic converter is in question, you can check it with an infrared thermometer. Take a look through this link that explains how to test one:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

When you check the temperature, the outlet of the converter should be hotter than the inlet.

Let me know if the code or codes you have are P0420 or P0430.

Joe
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Wednesday, June 26th, 2024 AT 9:03 PM

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