Go with the Blox CEL fix. I've got an 06 and after around 4k miles, I still have no CEL with my TP. I don't know what the big difference is, but whatever they did, it works well.

 

MY06+ are kinda funky with the TP CEL. Sometimes the mechanical o2 fix doesn't work...sometimes it does.

For an MY03...I'd give the spark plug anti-foulers a try since they are 1/4 the price of the Blox. If it doesn't work then you can pick up the Blox and not be out all that much money.

 

I tried the 2 spark plug defouler trick with no luck on my08. I have the Berk ceramic coated header and Berk SS HFC.

 

nice info

 

This trick works great. I have been using this on my06 with 70mm invidia for over 10000 miles no cel no problems. Works on any car with heated downstream 02's. Have used a version of this on three different mustangs and one civic as well with good results.

 

had it on for about 1000 miles with no cel. Good luck!

 

Going to throw my input in here. I put a full exhaust system on my 2002 AP1 at the beginning of the year (header, test pipe, & catback) and I put the 2 defoulers on the test pipe and it worked like a charm.

Fast forward to now. The AP1 is gone and I'm now in a 2006 AP2. I saved the exhaust system from the AP1 and it's now on my AP2 and I got a CEL after a day of driving or so. A local friend has the exact same exhaust setup on his 2005 with the 2 defoulers and he doesn't have a CEL issue.

I've read a good bit and saw the 3 and 4 defouler trick work and not work. I've also read about the steel wool trick work and not work. I'm thinking about just ditching the test pipe and getting a Berk High Flow Cat. Thoughts?

Just my $0.02.

 

what size defoulers should i get as i'll be doing this soon?

 

Ditch the testpipe! I tried it all.... steel wool 4 ant-foulers, 3 of which from autozone and 1 from T1r. Nothing works for 06+. Some of them work but majority is so stubborn.

 

will this work on a 2006 s2000 and if so .... does it have to be 1/2 drill bit ? can i use a 3/8 bit or does it have to be a 1/2 inch bit ... my drill will fit upto 3/8 bit