How much is a factory catalytic converter & oxygen sensors -
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post #1 of 7 Old 09-07-2017, 10:56 AM Thread Starter
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How much is a factory catalytic converter & oxygen sensors

I drive an 06 Grand Cherokee 3.7L. I had some misfires and got the ignition coils/sparks plugs replaced and the fuel injecting systems (after driving on the highway for 30min). I took the car back home from the shop and everything was okay. However, yesterday the shaking during idling issue came back and the check engine light was flashing then stayed on. I brought it my car to the shop again and they told me that the catalytic converter is plugged and I need to have it replaced as well as the two oxygen sensors. They told me that a factory cat costs $1,300 and with the two sensors plus labor, I am looking at $2,400...
is there anything that doesn't sound right?

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post #2 of 7 Old 09-07-2017, 01:45 PM
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A good, local, trustworthy muffler shop should be able to tell you if the cats. are truly plugged up. A good computerized diagnostic scanner can also detect problems with them. It is somewhat rare, unless there have been ongoing 02 (fuel mixture) problems. Then they usually overheat and the catalyst disintegrates. The muffler shop would probably first pound on them with the palm of his/her had (or use a rubber mallet) and see if they rattle, indicating catalyst fragmenting. They would also probably burn a hole in front of and in back of the cats. and check the back pressure on both sides of the cat. The pressures should be very close to the same on both sides.

New factory cats. (usually come as a complete "Y" pipe with cats.) are indeed very expensive. Again, if they prove to be bad, a good muffler shop should be able to weld in some "approved" cats. for a whole lot less $$$. O2 Sensors usually run ~$30-50 each and, if you have more than about 100K on the vehicle, I'd replace them all....two in front of cats., and two after the cats.

Also, coils rarely fail and would not need to be replaced. These are easily checked also, rather than just replacing them. Were there any Diagnostic Trouble Codes (DTC) showing? Other things can cause idle issues too, such as a contaminated Idle Air Control Motor.

Good luck and let us know what you end up doing and how it turns out.

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post #3 of 7 Old 09-07-2017, 02:22 PM
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Before you replace the O2 sensors, check the fuses and relays. I once wasted a lot of money on new sensors when the fuse was the real problem.

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post #4 of 7 Old 09-07-2017, 03:18 PM
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$1300 is what the OEM ones cost... Check out a Magnaflow one, about half the cost if de!eting isn't an option.. Kolak can hook you up I believe...

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post #5 of 7 Old 09-07-2017, 04:30 PM
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Went through this with my 07 a couple of years ago. Was getting the P013 slow O2 sensor response code. It was caused by a crack in the converter letting in extra air. Because it was before 80k miles I got it done for free (fed emissions warrsntee).
In NY we have Cali emissions which I feel is completely outrageous we never asked for that. And guess what, after market cats may not cut it with the Cali emissions.

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post #6 of 7 Old 09-08-2017, 12:08 AM
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What code(s) are stored? Did the shop tell you?

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post #7 of 7 Old 09-26-2017, 04:25 PM Thread Starter
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I decided to go with the repair because I didn't think the car would worth any if it had the bad act. Now it drives fine but sometimes shakes a little bit for a brief second (power is not going through from the engine to the wheels) when I accelerate from stop or very low speed. Bought the car in 2014 and never experienced mechanical issues until this time. I feel that the car has reached the stage where it starts to have many issues.
Thanks for all y'all's responses!
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catalytic converter , grand cherokee , misfire , oxygen sensor

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