95 Volvo 850 Oxygen sensor (B5252 engine)

Vanillagorilla · Post by **Vanillagorilla** » 29 Dec 2011, 11:42

Hello all,

Recently my O2 sensor light came on on my dash and, in looking for a replacement part, I've hit a major road block. My car has the 10 valve Canadian engine (B5252) which apparently only has 1 O2 sensor. Every auto parts store I call seems to think that I have 2, which tells me that their books assume that I have the 20 valve engine. Volvo parts seems to know what part I need, but they want to charge me $397 Canadian for it. I'm hoping that someone out there can tell me what the Bosch replacement part number is so that I can order it online and save a truck load of money.

Any help would be greatly appreciated.

Thanks

Post by **rspi** » 29 Dec 2011, 13:34

As the stealer is the part for the other 850 are the same part #. If so, go get one from a salvage yard.

Vanillagorilla · Post by **Vanillagorilla** » 29 Dec 2011, 14:07

I'd really like to avoid installing a used sensor. I'm sure that I can find a new one on Amazon for a reasonable price. I just am not sure what part number to order. Amazon (like all websites I've searched) assumes that I have the 20 valve engine.

turbozutek · Post by **turbozutek** » 29 Dec 2011, 16:13

IIRC, that O2 sensor is not made by Bosch. On the European 10valves, the O2 Sensor is made by a company called DENSO.

http://www.lambdapower.co.uk/partsearch ... t=LP-20504

That's the good news, the bad news is that even here the cheapest part that fits is £130 ($245 odd). The worse news is that universal sensors don't work for shit on these engines - the ECU throws the toys out the pram really quickly.

I'd get you more information, but the UK Volvo forum is down right now... When it's up give it a wee search; there have been many threads on the 10 valves emissions systems.

Chris...

Post by **precopster** » 29 Dec 2011, 16:30

I have a 10 valve (Australian) 850 and turbozutek is right on the ball except for the brand and link. I believe the link below will help.

Don't bother with a Bosch part. The 10 valve runs on a Siemens ECM and they chose to configure their programming for the O2 sensor for a TITANIA class sensor.

These sensors switch differently. If you put in a Bosch as I first did the engine will run beautifully for the first 15-20 secs when cold then all hell will break loose.

Just Lambda has your sensor: http://www.lambdasensor.co.uk/main/volvontk.htm

OTA4N-5A1 or OTA4N-5B1 is the one to use depending on your model year.

They list an NTK brand which is exactly the brand the factory fits.

Vanillagorilla · Post by **Vanillagorilla** » 29 Dec 2011, 20:17

Thanks you for all the help. My Volvo is not listed in your link. Mine is a non-turbo 2.4litre with the b5252 engine. Any other ideas?

Post by **precopster** » 29 Dec 2011, 22:34

They're known as either 2.4 or 2.5 litres depending on the foreign market they were sold in. All engines were 2435cc in capacity or if turbo R models were 2.3 litres, but these all had Bosch ECMs.

The OEM number you require is 3507256. Run this past them at Just Lambda. I'm certain it will be a match.

Also look at the wire colours from the sensor . They should be:

Black Ref. (out)
Yellow Ref. (in)
Red Heater (+)
White Heater (-)

these colour combos are only used with Titania O2 sensors.

Vanillagorilla · Post by **Vanillagorilla** » 29 Dec 2011, 22:59

Just lambda does not ship to Canada... Anything that ships to Canada or the USA will work. I have an address just across the border.

Post by **precopster** » 29 Dec 2011, 23:15

Just googled it:

http://www.ngkpartfinder.co.uk/car_comm ... &pos=Front

http://www.sparkplugs.co.uk/pages/datab ... =OTA4N-5B1

http://www.moatdirect.co.uk/lambda-sens ... -747-p.asp

OR THIS

http://www.skandix.de/en/spare-parts/en ... e/1002640/

turbozutek · Post by **turbozutek** » 30 Dec 2011, 02:56

Yeah yeah, DENSO is maybe some ME7's the more I think about it. I have a 20v so it's a Bosch, but I could vaguely remember a bunch of threads on volvoforums.org.uk lamenting the O2 sensors on 10 valves.

Ok, as for buying from the UK - I can buy the part and ship it to Canada air-mail if it helps, just let me know!

Chris...