PO420 Exhaust Code?

F.I. Inc. · 05-21-2011, 11:52 AM

Quote:

Originally Posted by Rooskey

Well I was cruising around and my service engine soon light came on. My mechanic has a KAL-Equipment obd-II scanner and the code came up as PO420 (catalyst effeciency below threshold). Any idea's on what it may be. I have FI longtubes with stock nismo exhaust.

That is odd that you have gotten a CEL with our headers. I can be honest with you and tell you that close to 100 sets sold between the 370Z & G37 and this is only the second or third set that I have seen throw a CEL. Every time before it was always attributed to an exhaust leak or bad O2 sensor. Again, this is not common and I have customers with 10's of thousands of miles on these without a CEL.

If you have time, please call me Monday so we can troubleshoot this together...

Thanks, Tony

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