Rear oxygen sensor and Air mass sensor fault

aslan · Oct 14th, 2015, 06:24

My engine light came on and using VIDA I obtained this

2015-09-17 23_09_25-VIDA - XC90.png

The rear oxygen sensor may need replacing, I've cleaned the connection but the light still comes up. Do I need a special tool to remove the rear oxygen sensor and do I need to lower down the cat?

With the air mass sensor fault, I guess I'm looking at a new air mass sensor? I've tried cleaning the air mass sensor using a CRC air mass sensor cleaner and it's connector but the fault is still coming back. The XC90 has 86k miles and I feel the air mass sensor should last longer based on other volvos I've owned. Should I buy a new one or can I get away with a used air mass sensor?

Thanks

oragex · Oct 14th, 2015, 09:59

For the MAF maybe have a look at this

aslan · Oct 18th, 2015, 01:44

Can't find a suitable cleaner to clean the MAF. I had and was using CRC mass air flow cleaner but ran out of it. And the shop that sold it have stopped selling it.

My MAF is more like this. The wire sensor is buried deep inside. I have in the past regularly 'cleaned' it by spraying inside the hole. But after seeing this video, I'm doubtful you can clean the sensor inside.

https://youtu.be/RFnfi25p3po

Oct 14th, 2015, 06:24	#1
aslan From far away Last Online: May 9th, 2023 05:21 Join Date: Dec 2006 Location: Selangor	Rear oxygen sensor and Air mass sensor fault My engine light came on and using VIDA I obtained this 2015-09-17 23_09_25-VIDA - XC90.png The rear oxygen sensor may need replacing, I've cleaned the connection but the light still comes up. Do I need a special tool to remove the rear oxygen sensor and do I need to lower down the cat? With the air mass sensor fault, I guess I'm looking at a new air mass sensor? I've tried cleaning the air mass sensor using a CRC air mass sensor cleaner and it's connector but the fault is still coming back. The XC90 has 86k miles and I feel the air mass sensor should last longer based on other volvos I've owned. Should I buy a new one or can I get away with a used air mass sensor? Thanks __________________ XC90 2.5T 2009 B5204T5 S80 2005 - sold B4204T3 V40 2004 - sold B230E 740 1989 - sold

Oct 14th, 2015, 09:59	#2
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	For the MAF maybe have a look at this __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

Oct 18th, 2015, 01:44	#3
aslan From far away Last Online: May 9th, 2023 05:21 Join Date: Dec 2006 Location: Selangor	Can't find a suitable cleaner to clean the MAF. I had and was using CRC mass air flow cleaner but ran out of it. And the shop that sold it have stopped selling it. My MAF is more like this. The wire sensor is buried deep inside. I have in the past regularly 'cleaned' it by spraying inside the hole. But after seeing this video, I'm doubtful you can clean the sensor inside. https://youtu.be/RFnfi25p3po __________________ XC90 2.5T 2009 B5204T5 S80 2005 - sold B4204T3 V40 2004 - sold B230E 740 1989 - sold

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