Catalytic converter replacement

Tiny
RC52
  • MEMBER
  • 2010 NISSAN MAXIMA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
I recently blew a head gasket. Replaced the engine but apparently ran a lot of coolant/water through the system and by extension the catalytic converters. The mechanic who did the motor swap indicated the check engine light was because of bad catalytic converters. He indicated all would need to be replaced. I know unburnt fuel can cause cat failure. Would coolant/water have the same effect?
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Saturday, August 3rd, 2019 AT 9:17 AM

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Tiny
KASEKENNY1
  • EXPERT
Hi,

So unburned fuel will break down the catalyst inside the converter that is responsible converting harmful emissions to non harmful. This causes it to be "hallow" and not efficient. When oil, coolant, and water go through the converter it actually clogs it up and causes it to be less efficient and set the light. So if you have a code for catalytic converter inefficiency then more than likely it is clogged or restricted.

If you are replacing that, I would just go ahead and put new o2 sensors in it as well. You are there and it is not much more to just renew it all at the same time because what ever went through the converter also past by the sensors and the tips can get clogged as well.

Let me know if you have more questions. Thanks
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Saturday, August 3rd, 2019 AT 9:26 AM
Tiny
RC52
  • MEMBER
Thanks very helpful. Forgot to ask how many catalytic converters on the 2010 Maxima?
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Saturday, August 3rd, 2019 AT 2:14 PM
Tiny
KASEKENNY1
  • EXPERT
You have two. One coming off the front cylinder head and one on the rear.

I attached the replacement procedure. Let me know if you have other questions. Thanks
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Sunday, August 4th, 2019 AT 2:12 PM

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