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Old 03-22-2012, 09:57 PM   #1
Scooby Newbie
Member#: 288997
Join Date: Jul 2011
Location: Santa Barbara
2003 WRX

Default PLEASE help me pass smog!

I bought a 2002 WRX and it had a cat delete on the UP and DP. I just bought a used TiTek DP with a cat that appears to be in very good condition and the guy who sold it to me had papers showing numbers that it passed on his car months ago. I did the swap today and the CEL is still coming on. I have heard that it takes miles for the computer to get used to this. should i wait a few days and reset it again? Will this set up work? I have heard that a cat delete on the UP will not through a code. Thoughts? could it be the sensor?


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Old 03-22-2012, 11:45 PM   #2
Scooby Guru
Member#: 37359
Join Date: May 2003
2003 WRX


I can't answer all your questions, but I can help with a couple.

No, do not wait a few days then reset it again. It does take a while for the "ready" indicators to be set and every time you reset the ECU, it starts again. When I had issues with my Honda, I had trouble getting the indicators to reset with my short commute, despite a couple of weeks driving. I Googled a bit and did something like the sequence below, which caused them all to become ready.

1. Make sure the fuel tank is between one-quarter and three-quarters full; half a tank is ideal.

2. Start the engine and immediately drive the vehicle for at least 15 minutes at a speed greater than 50 mph. During the warmup, try to avoid sudden acceleration, hard braking and/or lane changes.

3. Drive the vehicle at a steady 55 mph for three more minutes. During this stage of the drive cycle, it's crucial that you keep throttle angle changes to a minimum.

I've no idea if this is real or fake, but a 15 mins highway drive at steady speed worked in my case (remember, it was not a Subaru though).

Second, you can get a code from the uppipe if the exhaust temp sensor has not been tricked by inserting a resistor in its place. Most likely the previous owner did that - it's a common fix. You really need to know what codes are being thrown or it's just guessing.
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