Here is how Sin show repair yourself. Hope Sin don't mind I post this .



A2 socket 4-3-5 and other O2 sensor related Fixes 𖛊]
By Sin on Monday, 8 October 2001, at 11:54 a.m.

For those of you with codes such as 4-3-5, or any other codes that pertain to poor performance of O2 sensors, try this.
First of all, O2 sensors typically fail for one reason. REALLY *hitty gas, especially in Canada. The essentially dirty gas tends to leave deposits on the ceramic sensor within the exterior shield of the O2 sensor. These deposits often cause improper functioning of the sensor. Common contaminants from gasoline are MMT (the lead replacement which actually pollutes practically as bad as lead itself, just in
Other ways) and sulfur. Other forms of contamination include silicone from seals and gaskets, low quality
Fuel additives, engine oil, as well as many they source.

At this point, this is where the majority of us head to the dealership, only to find out the sensor is about
$275 Canadian, plus about an hour or more for labor.

However, if you are basically handy with a 22mm wrench, some brake cleaner, and a blow torch, this
Most common failure can be rather easily fixed.
Lately, I had been pulling code 4-3-5 in the A2 socket. I have reset it a couple times now, and had bee planning an O2 sensor replacement this Wednesday (Bosch 4-wire universal). However, an engineering friend had explained this process out to me and why it works, and I decided to give it a go.

So this BEAUTIFUL, cool, fall morning, in Toronto, I removed the O2 sensor, torched it to burn off the Contaminants, cleaned out the contaminant residue with brake cleaner, reinstalled, and I was simply Amazed. It felt like new O2 sensors had been installed. Much more get up and go, easily 80% into the Boost range on the gauge at full throttle (I have a number of mods to get the extra boost), spiking to about 85% on the 1-2 shift, much smoother idling, not running nearly as rich, and in general, a better running engine. And I bet I'm going to get noticeable fuel savings.

It took less than an hour, and with just how great the car was running, I just had to go for a drive to enjoy my baby, who recently got a full suspension upgrade (springs, shocks/struts, anti-roll bars, bushings, etc). In fact, just thinking about how nice my baby is driving right now is making me want to go for another drive.

I've got a tone of studying to do for midterms in about a week, but I just can't resist:) Just one hour;)
BTW, for I believe derspi, I finally got around to playing with the adjustments on the Konis. Full soft
Makes the car feel SO luxurious, but really takes away from the performance. Full hard was ridiculously
Fun, but slightly jarring from the rear with the lightness in the back. I am running about 55% -60% stiff on the rear and about 50% stiff on the front. With my recent alignment, and the shocks/struts at these settings, the car is remarkably neutral. I can get the car into 4 wheel drifts without using the handbrake.
And while in drift, the car SLIGHTLY underscores, making the car VERY predictable with a VERY high handling threshold.


Jonathan :
Found this information from http://www.evenfive.com/volvo/
Check this site, they have more tips on oxygen sensors.
And Sin had posted a fix as to torch away all the build up around the faulty sensors so as to clean it and put them back
On.

"Rod
O2 sensor part fix
I found a generic 4-wire sensor from Bosch at Auto Zone. Bosch #15717. Spliced it in, reset the check engine light and
It fixed the problem. It cost $49.95 vs. $200 from Volvo. I couldn't be more pleased."

Oxygen Sensors 850 1996

You can get cheaper O2 sensors but they are generic and you have to wire them yourself. Stick with the Bosch for easier
Installation...it simply plugs in. I found one at Advance Auto parts for $130 several months back but you may be able To do a little better if you search.

Jim