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Red99DakR/T
Dodge Dakota
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2/11/2007
08:14:06
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 Subject: Check Engine Light w/ Cat indication
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Message:
Ever since I got my Dak, I have been hampered with a Check Engine Light. At first I wouldn't get a code, then I changed both the Up Stream and Down Stream O2 Sensors and now the code indicates the Cat is the problem. The Cat back is an after market put on by the previous owner and when I clear the code, it takes from 50 to 200 miles before it returns. The Dealer said the only remedy is to replace the Cat with an OEM from the dealer. Is there any way to defeat this with different O2 sensors etc?
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Moontree
Dodge Dakota
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2/13/2007
07:34:25
| RE: Check Engine Light w/ Cat indication
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Message:
this is a wired in bypass. copy this to Ebay cost under $10
MIL eliminator O2 oxygen sensor simulator OBD II bypass
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Fasstdak
Dodge Dakota
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2/13/2007
12:44:41
| RE: Check Engine Light w/ Cat indication
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Message:
If you're getting a Cat efficiency code, have it replaced under the 8/80 Federal Emissions Warranty. If you're out of warranty, replace the cat with a high-flow.
There is no easy way to bypass the rear O2 sensor with just a wire...doesn't work that way. Check with Caspers Electronics for the Dodge O2 SIMM - they're inexpensive and work very well. I have one on my '97 for almost 5 years now - no problems.
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Fasstdak
Dodge Dakota
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2/13/2007
12:49:00
| RE: Check Engine Light w/ Cat indication
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Message:
I looked that up:
"The MIL eliminator is a small electronic device designed to modify the signal produced by your vehicle's oxygen sensor to report the efficiency of the catalyst system. All vehicles made after 1995 (OBDII diagnostic equipped) have one (or two, depending on your vehicle) oxygen sensor after the catalytic converter. Once the catalytic converter is removed or altered, the signal is disrupted and the computer activates the check engine light to notify the operator that something is wrong. Once the check engine light is on, any other problem with the vehicle could go unnoticed and serious damage could occur. Along with this, your car goes into what is known as "limp mode" and your vehicle's air/fuel mixtures and ignition timing goes into default causing your car to run poorly.
By using the MIL eliminator, your check engine light will not be tripped anymore by your aftermarket exhaust and your vehicle's diagnostic system will now be able to notify you of any other serious problems. Plus you will benefit from recovering lost power and better gas mileage. Some customers have reported an increase of 6 MPG and 10 HP by using this product!
"
Bahahaha...sorry dude, the PCM doesn't look at a disrupted signal at all. It looks for timed changes within the forward and rear O2 sensors. Also, the vehicle will NOT go into "Limp Mode" with a bad O2 sensor - again, the PCM doesn't work that way. This is a mis-guided fool who's selling those things.
Easy explanation: You'll need to build yourself a timer (tick-tock) circuit and alternate the voltages in between .2v to .8v. Getting the actual time change interval is what trips the MIL or not.
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Red99DakR/T
Dodge Dakota
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2/14/2007
20:41:44
| RE: Check Engine Light w/ Cat indication
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Message:
I don't know if it was something I did trying to get my Keyless Entry to work, but I disconnected my battery and commenced to disconnect and reconnected every set of connectors I could find thinking I might have a corroded connection and suddenly I've driven 230 miles without the check engine light comming on. Crossing my fingers. BTW, I resolved the problem with my keyless entry by totally pulling the remote apart and cleaning it with alcohol.
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Pacman
Dodge Dakota
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2/18/2007
10:50:23
|  RE: Check Engine Light w/ Cat indication
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Message:
Doubtful. If your CAT has high miles on it, it will not perform to specs. I recently put a Magnaflow 94000 series CAT Converter on my 2000 R/T (at 108k miles) with a new Flowmaster 50 Series Delta Flow on 2 1/2" pipe dual out the back. Plus new Premium O2 Sensors. (Yes I'm proud of it, can't you tell?)She drives great and smells less. Before the change, it was always running rich. The O2 Sensors are so sensitive to change (we're talking less than 1/2 a volt) that it wouldn't take much to trigger a fault code. My muffler man asked me why would I change the CAT if it didn't have a code or seem clogged? It's not rocket science but it is science - the chemical make-up of a CAT will not last forever. BTW, you do not have to go to the dealer for a direct replacement. Check out Magnaflow. Good Luck!
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