Codes After SW exhaust install

[License2Bill]

Last night on my way home from work, the Check Engine light came on. When I got home, I plugged my reader in and came back with P0153 as the current fault and P0133 pending fault. P0153 is driver side upstream sensor (bank 2 sensor 1) circuit slow response, P0133 is passenger upstream circuit slow response.

I've had the headers installed for 2-3 weeks now with no issues. Why now when I'm due for emissions?

[martyo]

Did you have your tune adjusted for the headers?

[License2Bill]

Negative. It's news to me that it's necessary. Car is still on stock tune

[martyo]

Negative. It's news to me that it's necessary. Car is still on stock tune

That's no bueno.

[ctrlraven]

You need a tune before you hurt the motor.

[Logizyme]

You would not have happened to acidentally plugged in the o2's to the opposite banks did you? - its easy and causes some pretty weird symptoms/codes.

[justbob]

The tune adjusts for the delayed response as your o2's are now farther away.


Builder Of Badassery

[Zack]

You would not have happened to acidentally plugged in the o2's to the opposite banks did you? - its easy and causes some pretty weird symptoms/codes.

That is only easy to do on a Mustang.

Near impossible on a MM.

[License2Bill]

Green's are up front. Blue's in back. Guess I'll be borrowing a car until I can pony up the cash for the tuner and tune

[ctrlraven]

Just avoid any WOT runs or aggressive driving, drive it like a grandpa.

[jwibbity]

Just avoid any WOT runs or aggressive driving, drive it like a grandpa.

too late for that, :lol: aint that right Bill???? :burnout:

[License2Bill]

too late for that, :lol: aint that right Bill???? :burnout:
Yea about that... Now I know better and hopefully the engine isn't dickered from when I went to autocross last week

[Logizyme]

That is only easy to do on a Mustang.

Near impossible on a MM.

Like I said - its pretty easy.

Does not usually happen when your working on the exhuast - it usually happens when the transmission or engine is removed. Seen a handful of cases on Panthers before.

[justbob]

You'd have to be a real moron to mix up the connectors..! Is that even possible? Like for real?


Builder Of Badassery

[champ1173]

Here's a semi related question. If you need a tune to run headers, how do you pass emissions? Wouldn't it throw a code like the OP?

[justbob]

Here's a semi related question. If you need a tune to run headers, how do you pass emissions? Wouldn't it throw a code like the OP?


Post 7 explains this. Assuming you keep converters, and leave all monitors on you'll be fine.


Builder Of Badassery

[jsignorelli]

I had to retune the computer after my SW system was installed. So.. I took it for a dyno tune and reprogram...WOW...Di IT!