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Help needed!!! Exhaust issue

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Old Jan 28, 2018 | 06:58 PM
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Default 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.
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Old Jan 30, 2018 | 01:33 PM
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Which O2 sensors did you replace AND with what CATs did you replace the previous with?
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Old Jan 30, 2018 | 04:25 PM
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Originally Posted by Gville350
Which O2 sensors did you replace AND with what CATs did you replace the previous with?

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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Old Jan 30, 2018 | 04:34 PM
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Yeah, should have done all 4 O2 sensors. Wouldn't hurt to clean the MAF too.
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Old Jan 30, 2018 | 04:55 PM
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Originally Posted by Gville350
Yeah, should have done all 4 O2 sensors. Wouldn't hurt to clean the MAF too.

Okay, I’ll give it a shot. I’ll likely do a full time up as well. I will update once completed. Thanks
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Old Jan 31, 2018 | 10:12 AM
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Clean the MAF and look for vacuum leaks.
An empty paper towel tube to your ear can be of directional assistance if the leak is big enough.
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Old Jan 31, 2018 | 02:08 PM
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^A rental fog machine is your best friend if you fear a vacuum leak.
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Old Feb 6, 2018 | 06:05 PM
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Originally Posted by Gville350
^A rental fog machine is your best friend if you fear a vacuum leak.

no no vacuum leaks. Cleaned MAF sensor, no luck. Replaced both upstream sensors. So far so good but it’s only been a day so I’ll give it more time and repost an update. Any other suggestions?
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Old Feb 7, 2018 | 01:46 PM
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So after you replaced both the upstream O2 sensors everything is back to normal with ZERO CELs?
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Old Feb 8, 2018 | 05:48 PM
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Originally Posted by Gville350
So after you replaced both the upstream O2 sensors everything is back to normal with ZERO CELs?
yes both sensors replaced. No CELs
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Old Mar 31, 2022 | 10:53 AM
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sorry realized i was in the wrong section
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