Nitto Mid-Pipe Check Engine Light fix

[ROCKLAND TOYOTA]

Originally Posted by largeorangefont

Rockland,

Your ECU is not scouring the internet looking for proof that you have screwed with it.. and throwing CELs when you wake up in the morning.

What you fail to realize is how an ECU works. ECUs operate on voltage signals from sensors. When voltage is out of an acceptable range on a given sensor for a certain amount of time, an CEL is given (or worse, it depends on the sensor).

By wiring in a resistor to give the ECU a different voltage reading, or by mounting the o2 sensor out of the stream of exhaust you change the voltage sent to the ECU. If the "new" signal is within accepted limits, a CEL is never thrown. These limits don't change, and the ECU does no "learning" for the rear o2 sensor.

If you don't throw a CEL in the first couple days, or couple hundred miles, you will probably never see one for cat ineffiecicy. These types of CELS are not thrown right away because cats are less effective when cold, and the ECU is programmed to account for that. Again, no "learning" involved.

good explanation but i never said the wiring method was bad. just the fouler

[largeorangefont]

Originally Posted by ROCKLAND TOYOTA

good explanation but i never said the wiring method was bad. just the fouler

The foulers do the same thing but mechanically. You are reducing the amount of exhaust gasses the sensor is exposed to, and skewing the reading. Some cars need 2 of them to keep from throwing CELs, one drilled for the sensor, and one undrilled.

[ROCKLAND TOYOTA]

Originally Posted by largeorangefont

The foulers do the same thing but mechanically. You are reducing the amount of exhaust gasses the sensor is exposed to, and skewing the reading. Some cars need 2 of them to keep from throwing CELs, one drilled for the sensor, and one undrilled.

ok so you finally got in your head what ive been saying except for the fact that even with the double fouler method that CEL still comes on. NO, who on here is running this setup and has no light.......

[Malaya1221]

no CEL!

[ROCKLAND TOYOTA]

Originally Posted by Malaya1221

no CEL!

yeah cause you just put this on a week ago or so correct???

[Malaya1221]

Originally Posted by ROCKLAND TOYOTA

yeah cause you just put this on a week ago or so correct???

had it b4 for 6 months WITHOUT CEL turning on till WEAPON R header broke!

[ROCKLAND TOYOTA]

Originally Posted by Malaya1221

had it b4 for 6 months WITHOUT CEL turning on till WEAPON R header broke!

awww should have done that right the first time.....

[largeorangefont]

Originally Posted by ROCKLAND TOYOTA

ok so you finally got in your head what ive been saying except for the fact that even with the double fouler method that CEL still comes on. NO, who on here is running this setup and has no light.......

See post #48.

[ROCKLAND TOYOTA]

Originally Posted by largeorangefont

See post #48.

see post 51

[largeorangefont]

Originally Posted by ROCKLAND TOYOTA

see post 51

That post would be great if it were correct. Again, that 02 sensor is just there to verify the cats are working.