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Check Engine Light after Hi-Flow cats - fix?

WL2005HBD

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Hey guys,

As I was warned, I have the check engine light after installing my aftermarket cats.
I've been told its because the O2 sensors (I believe the post cat ones) are picking up more emissions due to the new cats (apparently common after replacing with hi flows)
I know a dyno tune is a fix, but I have 2 questions:

1. Is there an easier way to stop this rather than a dyno tune? I've seen the spark plug defouler trick used on some euro cars, could this work/will it fit for a WL?
2. If a dyno tune is a must, how much am I looking at for simply reprogramming the ECU to not whinge about emissions?

Please no 'why hi flows/extractors/tune in a V6' or anything related to V6 bashing because it really does not help.

Thanks guys
 

Benboy

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Hi-Flo cats may be illegal to install on a road going vehicle. No further comment(s).
 

WL2005HBD

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As is modifying a V6 on your Ps. Did it anyway.

For the record, these are Euro III compliant.

Valuable input please.
 

aaronevolution

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As is modifying a V6 on your Ps. Did it anyway.

For the record, these are Euro III compliant.

Valuable input please.
Anyone with Tech2 can clear the code. No Dyno tune is needed. Holden will charge anywhere from $50-$100 just to clear the code.
 

MYVESSV8

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you could clear it that way but you need to adjust tune/setup so it does not come back
 

WL2005HBD

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@MYVESSV8
Exactly my point! I couldn't give a rat crap about who can clear it, my local mechanic offered to clear it for free, issue is it'll come back.

Anyone here had any positive experience with the spark plug non-fouler trick?
 

aaronevolution

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@MYVESSV8
Exactly my point! I couldn't give a rat crap about who can clear it, my local mechanic offered to clear it for free, issue is it'll come back.

Anyone here had any positive experience with the spark plug non-fouler trick?
Mine never came back. Enjoy
 

WL2005HBD

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You have a V8 though yes?
I have a 190kW V6, I have 4 O2 sensors, not 2
 

BerlinaBen

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Ok, So I'm about to replace both of my rattly cats on my VZ V6 wagon. I'm not planning on keeping the car longer than 12 months, so I didn't want to spend the thousand dollars to replace the cats with new standard ones and was considering just getting cheap hi flow cats installed for less than $500. Now, the question is, Am I also going to get the "check engine" warning light coming on? If so, does anyone have any better solutions?

I can see why people are happy enough to punch the cats out when it is such a huge cost to replace the cats with originals, given what the whole car is now worth.

Hey guys,

As I was warned, I have the check engine light after installing my aftermarket cats.
I've been told its because the O2 sensors (I believe the post cat ones) are picking up more emissions due to the new cats (apparently common after replacing with hi flows)
I know a dyno tune is a fix, but I have 2 questions:

1. Is there an easier way to stop this rather than a dyno tune? I've seen the spark plug defouler trick used on some euro cars, could this work/will it fit for a WL?
2. If a dyno tune is a must, how much am I looking at for simply reprogramming the ECU to not whinge about emissions?

Please no 'why hi flows/extractors/tune in a V6' or anything related to V6 bashing because it really does not help.

Thanks guys
 
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