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Dual cat 99 Cali 4Runner

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Old 11-08-2010, 08:13 AM   #1
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Dual cat 99 Cali 4Runner

Dual cat 99 Cali 4Runner


I am now in Colorado and have a California version with 2 cats on it. I am throwing an engine code that says I have a bad cat but not which one. They cost $750 and $950 each.

My question is:

Can I just run the rear cat and replace the front one with pipe?

Or will this throw the computer into a brain freeze?
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Old 11-08-2010, 05:18 PM   #2
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Location: Centennial, Colorado
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Just posted on this subject in the other thread you wrote in...here is what I said...
Hey Yukute, I have a Cali 4runner in Colorado too. Was getting codes after having it for a year or so (140-150k miles) and looked into this. Found out that Colorado is really astute with their testing so decided to keep it stock. Found the correct front sensor (A/F sensor) online for $80 bucks. Cleared all the codes for about three months, then started up again...started to run 91 octane and did a couple good fuel cleaners and have been great ever since.....IMHO its hard to get past keeping the exhaust stock here unless you want to spend the $$$$. Good luck
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2000, 4runner, 99, cat, cats, dual, problem, purpose, runner, single

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