Please Identify this engine part Topic is solved

[davidt513]

Hello Community,

I have purchased a 2004 XC70 from an auto auction site. I had to buy the vehicle without inspecting it prior.

I have noticed from the images I had available that there is a orange colored sensor in front of the mass air filter that the vehicle seems to be missing.

When I look in my 2005 S60 I see the same senor but it has an orange colored sensor with a thin wire type clamp on it.

Can someone please look at the picture and identify the sensor that seems to be missing; I have it circled in green.

What do I risk damaging if I drive the vehicle with this sensor missing as pictured in the photos that I have included.

Thank you.

PICTURED BELOW IS THE PICS OF THE XC V70 I PURCHASED: (Circled in green is the missing part that I can't identify)

Wide Engine bay view

2004 xc70 .png (861.63 KiB) Viewed 733 times

Close_Up of missing sensor

PICTURED BELOW IS AN IMAGE I FOUND WITH THE ORANGE SENSOR I AM REFERING TO. (I have it circled in yellow)

correct with sensor

THANK YOU!!!

[chris11211]

Should be the brake vaccum switch. Side effects are mushy brakes.

This should be the part. Heading to bed after this post, so just double check the part number or wait for someone to confirm with me.

https://www.fcpeuro.com/products/volvo- ... 25#reviews

[EngineeringBloke]

Yes, it is the vacuum switch for the power assisted brakes. When there is low vacuum in the manifold, the switch tells the vacuum pump to run to enable power assist for the brakes.

It looks like you are missing the electrical connector from the top of the switch. You will probably need:

• a new or replacement brake vacuum switch

• find the electrical lead for the switch (which should be in front of the air filter box but has fallen down) and plug it into the new switch

• a new brake vacuum pump may be needed

Sometimes the brake vacuum pump will run until it fails as it has not been turned off after vacuum has been achieved. As your switch has not been operational, have the pump checked. It is usually loud enough to be heard with the hood open when it runs. If you have restored good braking on start up after fixing the switch then the pump is probably ok.

[br0dy519]

Depending how long it has been broken, your vacuum pump might be dead as a result. Please jump the connector feeding this switch with key in pos 2 and you should hear your vacuum pump turn on. Check your 15A fuse. I just replaced my vacuum pump today ($140 CAD from Rockauto) and it had a dead short in the motor causing the fuse to blow.

Also if you live in an area with no Volvo parts availability like me, use Dorman 926-887 like I did. Works fine.