s2kshepard

Hey guys,

Ok I want to first explain the mod pattern because it's a little unusual.

I installed a gernpipe with integrated HFC and a dual T1R exhaust. I drove the car home about 20 miles from where I did the install, all good. Car then sat in storage for about a week. All is well.

Then I drove the car 20 more miles and installed a K&N intake and replaced a crappy gasket between the gernpipe and exhaust (was a used exhaust).

Then I drove the car 20 miles home. Then I drove the car to 15 miles to work today and it threw a check engine light (CEL). Code is P0420 Catalyst System Efficiency Below Threshold (Bank 1). Obviously this looks like the gernpipe cat not passing, which I am not necessarily concerned about immediately as I head to my track day tomorrow. I just want to confirm since this happened after the intake install with a track day tomorrow that this wouldn't be related to vacuum lines being installed incorrectly, or possibly running lean due to my tune not being setup for the new intake, right? I assume an intake alone would not necessarily need an immediate retune; I can't imagine it messes up AFRs that much compared to stock.

Thanks for listening to my concern with a new CEL the day before a track day!

Billman250

s2kshepard

I thought so! Thank you for the reassurance.

I assume running the track day with this code is no issue, I can just throw in the spacer trick next week? In my old car CEL seems to cause limp mode and it limits power but the s2k seems to be running fine.

thanks

Billman250

s2kshepard

Yeah that was my only thought. I'll bring my reader and check for new codes on long breaks, it's super easy. Appreciate it!

edit: actually I think I can disable the o2 sensor with the flashpro. That should clear it.