O2 Sensor Simulator SOLUTION!!!!
AudiWorld Super User
Joined: May 2002
Posts: 7,239
Likes: 1
it means you can run test pipes (no cats) without codes...this would be the first time I've seen....
anyone actually make it work.
The problem in the past with test pipes was that you'd get a check engine light. No big deal really, except, you then wouldn't know if your check engine light was being triggered by something else. You'd really need to be checking codes frequently so you don't miss something.
With this, the check engine light would not be on from the test pipes.
The problem in the past with test pipes was that you'd get a check engine light. No big deal really, except, you then wouldn't know if your check engine light was being triggered by something else. You'd really need to be checking codes frequently so you don't miss something.
With this, the check engine light would not be on from the test pipes.
Member
Joined: Feb 2002
Posts: 3,304
Likes: 0
since some dont know exactly what this is, and how cool it could be if it works long term
basicallyt he o2 sensors send a electronic signal to the ecu. thats what everyone is talking about when they say they ar logging their 02 voltages.
there are 4. 2 per bank. one measures the exhaust pre cat and the other measures post cat. on stock dp's i believe the first sensor measures after the pre-cat.....but this mod only applies to those running one cat, or no cats so dont worry about that.
so the 02's send a voltage based on a reading they are getting of the exhaust gas flow. the ecu checks that these voltages are normal in accordance to how much fuel it is giving, and in correspondance. so if there were an 02 that was bad, or absent, it would know because it doesnt correspond with other signals and the norm.
all these will do when you run test pipes is simulate that voltage. the sensors will not be sending a reading as much as just a dummy signal, based on a set voltage.
at least thats the way i think it goes. others can correct accordingly
joe
there are 4. 2 per bank. one measures the exhaust pre cat and the other measures post cat. on stock dp's i believe the first sensor measures after the pre-cat.....but this mod only applies to those running one cat, or no cats so dont worry about that.
so the 02's send a voltage based on a reading they are getting of the exhaust gas flow. the ecu checks that these voltages are normal in accordance to how much fuel it is giving, and in correspondance. so if there were an 02 that was bad, or absent, it would know because it doesnt correspond with other signals and the norm.
all these will do when you run test pipes is simulate that voltage. the sensors will not be sending a reading as much as just a dummy signal, based on a set voltage.
at least thats the way i think it goes. others can correct accordingly
joe
AudiWorld Expert
Joined: Mar 2000
Posts: 29,189
Likes: 5
From: Raleigh, NC
the stock sensor locations are before and after the precat
Most aftermarket downpipes do not have a precat, and therefore move the 2nd sensor location so it is after the main cat (this way there is still a cat between the sensors). If this cat is then removed and replaced with a testpipe, you now are left with no cat between the sensors, and thus the need for this solution to avoid a check engine light.
APR's first generation of downpipes removed the precat, but did not relocate the sensors. As such, they had no cat between the two sensors. Their solution instead was in software to create "Stg 2+" code which did not produce a DTC/CEL for such a condition. Since then, people have also used this APR Stg2+ code on cars with no cats (testpipes) as this is the only software that would allow you to do that and not get a DTC/CEL for missing/failing cats.
This hardware solution will trick any software into thinking there are functional cats in place.
APR's first generation of downpipes removed the precat, but did not relocate the sensors. As such, they had no cat between the two sensors. Their solution instead was in software to create "Stg 2+" code which did not produce a DTC/CEL for such a condition. Since then, people have also used this APR Stg2+ code on cars with no cats (testpipes) as this is the only software that would allow you to do that and not get a DTC/CEL for missing/failing cats.
This hardware solution will trick any software into thinking there are functional cats in place.
AudiWorld Super User
Joined: Feb 2004
Posts: 7,825
Likes: 0
If it works, someone could fab a plug-n-play connector and sell it
You could unplug each of the sensors at the firewall connectors and plug the dummy load connector in their place. It would take about 2 minutes. Someone could sell them for $20/each
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