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Help diagnosing o2 sensor vs. catalytic converter

Help, Advice, Owners' Discussion and DIY Tutorials on the third generation Volvo V70 wagon and XC70 crossover, and second generation S80. Are you an owner? Prospective owner? Get in here and join us! Start a new topic or comment on an existing thread.

2008-2016 V70
2008-2016 XC70
2007-2016 S80

Smacktapolis
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Joined: Fri May 15, 2020 1:52 pm
Year and Model: 2011 XC70 T6
Location: California
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Smacktapolis

Help diagnosing o2 sensor vs. catalytic converter

Post by Smacktapolis » Fri May 15, 2020 1:59 pm

Hello all.

I'm going someone can offer some assistance. I've got a 2011 XC70 t6 with 170k miles. Literally just got it yesterday shipped from Connecticut to California.

Problem is, it failed emissions with a permanent dct p0420.

I have an iCarsoft i906 and was looking through all the car data and ran across the o2 sensors running an odd voltage. From what I've read, the front (upstream) sensor should be fluctuating from 0.1v to 0.9v, however it's sitting at a solid 1.0v and not fluctuating.

My question, does anyone know if that is a bad reading for the front o2 sensor?

Thank you.

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