Can a tuned ECU fool OBD-II smog test that cats are present when running catless?
07-24-2006, 04:42 AM
#1
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Join Date: Jun 2006
Location: Marion, NC
Posts: 35
Car Info: 2002 WRX Wagon
tuning question
im farely new to tha subies. what im wantin to know is if i get a tune and ditch the cats will i be able to pass an emission inspection? thanks for any help.
jeremy
jeremy
07-24-2006, 05:57 PM
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You want a 'Pony Express' CEL fix. Simply a resistor that sends the signal the OBDII wants to hear. I am catless and have not thrown a CEL since the 'test pipe' went on and the PEP was placed inline (between O2 sensor and the OEM ECM).
www.boxer4racing.com
Here in Oregon they don't 'sniff' the exhaust ~ simply plug into the OBDII ports and look for a CEL history or 'check engine' light...
www.boxer4racing.com
Here in Oregon they don't 'sniff' the exhaust ~ simply plug into the OBDII ports and look for a CEL history or 'check engine' light...
Last edited by NW OBS; 07-24-2006 at 05:59 PM.
08-07-2006, 09:11 AM
#7
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Car Info: 93 BG5, 00&01 GM6, 06LGT, 07STi
I can reflash an ECU to make it NOT throw a CEL for the cats. However, it's really really hard to fool it into giving you a readiness code for the catalyst. It IS possible. You have to change the voltage range in the ecu. Depending on the year, make and model, I may have everything right here in my house for that. Adding a spark plug non fouler to the 02 sensor and changing the voltage range works every time.
I'm in VA btw.
I'm in VA btw.
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