Catless Downpipe

Member area: Post up your ride and the modifications to date
Posts: 1
Joined: Fri Jan 04, 2019 1:18 pm
Car: Infiniti G35

Catless Downpipe

Postby nicks300 » Fri Jan 04, 2019 1:27 pm

I recently installed megan test pipes on my G35 (downpipe with cat removal) and the check engine light came on due to the O2 sensors being disconnected. However, when I started driving it and giving it a bit of gas/going up a hill and pressing the gas harder, the car began to shake back and forth a bit. I’m not sure if it’s because of the downpipe or if it’s something else that happened to occur at the same time I installed it, but I just want to make sure. I also took it back into the shop, no leaks or loose bolts, but there is a manufacturer specific code when scanned. Anyone know either the reason the car is shaking or the manufacturer code?

Posts: 80
Joined: Sat Jun 07, 2014 5:42 pm
Car: 2007 G35 sedan (journey)

Re: Catless Downpipe

Postby tjrob2000 » Fri Jan 11, 2019 3:57 pm

If you have the O2 sensors disconnected then it won't run right. It can't give it enough fuel all the time. Reconnect the O2 sensors then go through the throttle relearn and idle air relearn.

Posts: 88
Joined: Wed Dec 26, 2018 9:12 am
Car: 350z, G37s, M35s
Location: Palm Springs, CA

Re: Catless Downpipe

Postby CarGuy87 » Tue Jan 21, 2020 12:25 pm

I second this. They must be plugged in even if reporting signal outside their OEM range.

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