Garage19builds

Hello I have a 3.4 Carrera throttle cable car with pre cat and down stream 02 sensors. I'm looking for information about the downstream sensors. I'm currently building building a strait pipe configuration and want to know the role of the secondary 02s? Do they just measure the cats? Will not having them plugged in cause the car to make any fuel / air adjustments or anything else that can effect or damage the engine. I understand I'll get a check engine light I'm also looking for a tune/ solution but want to know if it's safe to use the car until than? Any information greatly appreciated thank you.

pdxmotorhead

Simple way is to use the O2 sensor spacers with the small cats built in, they will fool the downstream in to thinking its after a cat.
Some even get away with just putting a spacer to push the sensor farther away from the exhaust tube..
Its just a cheap narrowband sensor that gives a cycling signal to the ecu..

Garage19builds

Thank you, i actually did order some 02 Angled Extenders that move the sensor further away and to an angle that they claim will work, regardless I just wanted to confirm that not using any or having them in without cats or mufflers wouldn't effect the engine or make it run awful. I have done alot to the car and am looking for and at tuning options to tie it all together. I just want to continue to use it safely in the mean time. The Extenders will be here tomorrow but I'm not even sure l want to weld in bungs for the secondary sensors if they're not needed.

De Jeeper

U can avoid the check engine light with the spacers (maybe). If u dont put them in it wont hurt anything just gives the code.

Flyfishnick

Your car looks great btw!

Garage19builds

Thank you!

jobyt

The 90° mini-cats worked well on the x-pipe I had for a while.