Help needed!!! Exhaust issue
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Help needed!!! Exhaust issue
I recently just purchased a 2006 IS250. It has been giving me a P0420 and P0430 code. I have replaced both sensors as well as both Cats. Still getting a cel like with the same codes. Any recommendations or fixes anyone knows about?
Thanks.
Thanks.
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i used OEM cats and Denso o2 sensors. Replaced both downstream and both cats. Just rechecked code after replacement and it’s actually P0171, system too lean. Now I’m thinking it’s either the upstream sensor, plugs n wires, or MAF sensor.
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