All Things Mk5 > How to Guides / Troubleshooting
Exhaust warning light - Powervalve 200 cell
AJP:
--- Quote from: Dan_FR on April 22, 2016, 01:54:15 pm ---Its the cat. Either fit the original or book it in with Niki
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Seems that's the consensus so far. Strange that it's taken so long for the warning light to show.
Obviously it'll be a trip to Hinckley rather than putting the standard cat back on!
pudding:
--- Quote from: AJP on April 22, 2016, 01:30:01 pm ---
--- Quote from: Paradox1 on April 22, 2016, 01:23:56 pm ---I was under the impression that even with a sports cat, you can still get the engine light on as the flow has increased. If the car drive as normal then that's what id put my money on. nothing to worry about, a map with sort it
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Do you know what code it'd bring up if that is the case?
I'd expect the light to have come on pretty much straight after the exhaust was fitted though, not months later.
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"Sensor 2 - system too lean / rich" or something along those lines.
As above, it's the cat. Sensor 2 is tuned to the factory cat(s). Sensor 2 expects a different signal to sensor 1. When both sensors see the same signal, it throws the fault code. It won't, or shouldn't, affect how it runs but it's a good idea to get it coded out. It's just an on / off byte in the ECU software.
This is the problem with aftermarket cats. They are rubbish at catalyst duties but good for flow.
AJP:
Cheers Pudding.
I'd have had the map updated by now, in fact I was booked in but had to cancel as the oem clutch was giving up. I'm all Helixed up now so I'll give Niki a ring after the service on Monday and get it booked in.
Should see a few more ponies from it too.
pudding:
Yeah definitely. You getting the standard throttle mapping put back on? I am :smiley: I miss the aggression of my Revo map too much!
How are you finding the Helix? Pretty good isn't it? I've had aftermarket clutches before that juddered like hell but this one is smooth as standard!
AJP:
--- Quote from: Pudding on April 22, 2016, 02:19:48 pm ---Yeah definitely. You getting the standard throttle mapping put back on? I am :smiley: I miss the aggression of my Revo map too much!
How are you finding the Helix? Pretty good isn't it? I've had aftermarket clutches before that juddered like hell but this one is smooth as standard!
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I'll just go with whatever throttle mapping he set the Stage 1 at, it feels good to me. Not sure what throttle map it is but it doesn't feel boggy or too linear, so I'm guessing it's not the 1:1 that some people don't seem fond of. Maybe that's reserved for higher output maps, k04 stuff?
That said, I am tempted to ask Niki to 'make it aggressive' as the Helix should handle anything a k03 can throw at it!
As for the Helix itself, it's spot on. Very good feel, no juddering, really positive pedal. It's heavier than stock but not massively. I was used to the pedal within about 20 miles of traffic.
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