Catalytic converters

Carmen Hernandez

Asked by Apr 26, 2016 at 04:37 AM about the 2008 Infiniti G37 Journey

Question type: Maintenance & Repair

I took my car in after service engine light came on.
They told me I need new catalytic converters. Im
not sure what the code was. I did notice my cars
performance has decreased especially while I'm
going uphill or while increasing speed. Do you have
any recommendations on what type of convertor
(brand, HFC's) I should use as a replacement?
What other things should get checked to know
what caused this problem in the first place?

3 Answers


Would need to know what the code was, but the symptoms you describe fit cats. The shop would get the correct cats for your vehicle.


First have a complete diagnostic scan with a Nissan Consult III scanner. Next, the correct diagnostic procedure is to check the pressure in the exhaust system. There is a "back pressure" spec a competent service facility will check this and record the results, before ever changing a catalytic converter(s). There are lot's of potentials for power loss besides / or in addition to catalytic converter(s) The reason for a I only use Factory OEM scan tools! for each manufactures vehicles. Regards


Factory catalytic converters hardly fail, might be your o2 sensors.

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