I've been running a Works HFC for months now. I have the flash and everything. Recently, my CEL came on, and I donated $85 to my local Mitsu dealer to find out that I have a problem with my cat.

I unscrewed the rear sensor in the IP, and sprayed it clean with brake cleaner. Reset the ecu and voila - problem went away. I figured that the sensor was fouled. Now the problem is happening more and more frequently.

Anyone else have this problem with their HFC? Is there a better way to clean off the O2 sensor?

 

My CEL just came one but I haven't had a chance to to read it yet. I've been driving for several thousand miles with the HFC without any problems.

 

david, invest in a OBD II scanner, and one use will make your money back

 

That's why I plan to stay with stock cat. I don't trust high flow cats.

 

Yes - I'll have to do that. Someone else said I could have gone to autozone or something and had them read it. Live and learn.

Here's a possible fix for people with the same problem...

http://www.norcalevo.net/forums/view...hanical+02+fix

 

Your HFC is just to efficient and letting a lot more exhasut flow. The computer thinks that something is wrong with the cat since its flowing so much.

 

I have the same problem with the Helix HF cat. Right now I'm running stock cat and sell the the Helix.
I think the problem is too much exhaust is going through the cat and the ECU thinks there's a problem but can't be sure unless someone do a sniff test.

 

I had the same problem when I had the Buschur HFC, so I just got the O2 Sim. and problem solved.

 

I've been running the Works HFC for more than 10k miles (yes, 15k miles) and have never seen a CEL because of it... I have heard that other "HFC" cause the CEL to come on, so I have also like others stayed away from them. Not to take business away from the dealerships, but go to autozone or Shucks (i think they are called kragen in Sac. CA) the price that they charge to pull the code from the car can't be beat... free!

 

Every auto parts store i have been to will pull your codes for free.

 

ignore this post....I was replying but found out it was in the works forum

 

Bump...........

Any updates on the Works HFC and CELs ?

One minute I've convinced myself that I want to go with a full 3" Works TBE with HFC (and Works O2 housing ) and then I read all these horror stories about CELs popping up left-right-and-center (not with the Works' HFC in particular, but HFCs in general) and I'm back to thinking about keeping the stock cat.

I'm also a little concerned about the temperature stability of the Works ceramic HFC base (compared to a stainless one).

Anyone here regret going the HFC route, rather than staying with the stock cat ?

 

I've never had a CEL come on with my WORKS HFC. There is definitely some power to be gained over the stock cat w/ an HFC, so no regrets here.

 

I thought brake cleaner was BAD for sensors? I did the anti-fouler trick and I no longer have any SES.

 

I've had the works hfc since around 8k, at the same time I got the 3 inch ceramic coated downpipe, and hks carbon ti. I'm at 12k now, no problems at all.