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Old 04-04-2004, 06:48 PM   #1 (permalink)
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cel 420 o2 sensor

I got a cel code of 420. the code has been pulled and cleared and returns leaves and comes back. I Know it has something to do with the 2nd o2 sensor reading the same value as the front sensor. Right? So if I use a meter on the sensors they both flucuate as they are supposed to. from lean to rich.00 to.9 something of the sort I am a volvo man so I know all those specs. It's the same sensor doing the same job? Whats up with the 2 cats? Anybody have this one?
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