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Volvo Emissions

Emissions system on our Volvos: EVAP valves, purge valve, air pump, oxygen sensors etc. Catalytic converter topics are in the Exhaust category.

September 25, 2014

1998 V70 AWD Front Oxygen Sensor Swap w Photos

MVS Forums contributor deepsouth shows us how a front O2 sensor swap is done on an AWD Volvo P80, including photos. This is a “from the top” DIY, meaning it’s how to do the front sensor swap access from the engine bay, not under the car. Outstanding. Just swapped the front O2 sensor on my 1998 […]

1998 V70 AWD Front Oxygen Sensor Swap w Photos
June 17, 2014

Does the Air Pump (SAS) Really Do Anything?

My airpump has started to sound like a vacuum grinding up a cat. Of course, the noise only lasts a minute or so, then it stops and all is well. I guess I have 2 questions:

1. What does the air pump do?

I ask this because the car runs no different before the thing kicks in and no different after it shuts off.

2. If nothing changes regardless of this thing being on or off, do I actually need it? Can is be simply unplugged and ignored?

Some people may gasp and sputter at that last statement, this is an honest question looking for a direct answer…

Does the Air Pump (SAS) Really Do Anything?
April 25, 2014

V70 P0455, P0440, P0442 Fix w/ Photos

Finally got fed up with the host of evap codes on my 1998 V70 AWD and went ahead and replaced the canister hoses, rollover valve hoses, purge valve (and surrounding hoses), and the three inches of rubber line connecting the small vent filler tube to the hard plastic line coming from top of fuel tank. I didn’t order any special hoses, rather went to Autozone and bought a variety of molded J and U hoses (they were kind enough to let me go the back and pick out what I needed).

V70 P0455, P0440, P0442 Fix w/ Photos
February 27, 2014

Running Without A Catalytic Converter. Smart?

2000 V70 GLT… was wondering if I could just have a muffler shop cut out the converter and weld a piece of straight pipe in place of it? My state dosen’t have any emission laws. Will this effect the drivability of the car? Thanks in advance. Any advice about this subject would be greatly appreciated. The cost of a new converter is approx. $1100, and a piece of straight pipe is around $35 to have put in.

Running Without A Catalytic Converter. Smart?
December 11, 2013

Replacing Exhaust Manifold – DIY Basics

The one time I’ve actually removed an exhaust manifold from an 850 n/a I remember the two lower bolts of the heat collector. That was a donor car that I was stripping so there was no need for finessing. I think I finally just ripped it out. Memory of details is vague as that was 5 years ago.

Replacing Exhaust Manifold – DIY Basics