IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

Volvo 850 O2 sensor troubles

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Krisemann
Posts: 6
Joined: Mon Dec 30, 2019 6:13 am
Year and Model: 1994 850 2.5 144hp
Location: Norway
Has thanked: 1 time
Been thanked: 0
Norway
Krisemann

Volvo 850 O2 sensor troubles

Post by Krisemann » Mon Dec 30, 2019 6:45 am

Hello! I've recently replaced my O2 sensor as my old one failed on me, and the new one works... To some extent. The car runs well for the first 30 seconds. After that the new O2 sensor kicks in, and it suddenly struggles to keep its idle, sometimes it outright dies. When I drive, it has a hard time accelerating; I have to floor it in order to get up regular hills, for instance. However, if I let the car idle for 10-15 minutes before driving, the car runs perfectly.

The sensor I've installed is a Ridex O2 sensor, from here: https://m.autodoc.co.no/ridex/13629202

I've tried resetting the ECU and running it through tests which users have posted on here (fuse, discharging wires, holding brakes for 2 minutes, leaving the battery unplugged overnight) and other boards, but nothing has helped. I've also tried WD-40 on the contacts. I did get an error code A2-512 once (rich fuel mix), but I haven't been able to replicate this error - usually I only get 111, so no errors.

My car is a 1994 Volvo 850, 2.5L 144hp 10v (no MAF, Titania sensor). Any help would be greatly appreciated :)

User avatar
RickHaleParker
Posts: 3577
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 434 times
United States of America
RickHaleParker

Re: Volvo 850 O2 sensor troubles

Post by RickHaleParker » Mon Dec 30, 2019 1:28 pm

Krisemann wrote:
Mon Dec 30, 2019 6:45 am
However, if I let the car idle for 10-15 minutes before driving, the car runs perfectly.
In other words: No power when cold.
Check for intake manifold leaks when the engine is cold.
A defective Coolant Temperature Sensor could throw off the Air/Fuel mixture.
These users thanked the author RickHaleParker for the post:
Krisemann
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

Krisemann
Posts: 6
Joined: Mon Dec 30, 2019 6:13 am
Year and Model: 1994 850 2.5 144hp
Location: Norway
Has thanked: 1 time
Been thanked: 0
Norway
Krisemann

Re: Volvo 850 O2 sensor troubles

Post by Krisemann » Mon Dec 30, 2019 2:35 pm

Thank you. Will check out those parts ASAP.

EDIT: Note that the engine runs fine the first 30 secs after startup (no matter hot or cold) - so I doubt it's the manifold. I'll look at the temperature sensor, though.

User avatar
RickHaleParker
Posts: 3577
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 434 times
United States of America
RickHaleParker

Re: Volvo 850 O2 sensor troubles

Post by RickHaleParker » Mon Dec 30, 2019 2:48 pm

Krisemann wrote:
Mon Dec 30, 2019 2:35 pm
EDIT: Note that the engine runs fine the first 30 secs after startup (no matter hot or cold) - so I doubt it's the manifold. I'll look at the temperature sensor, though.
Engines start on a rich Air/fuel mixture then lean out.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

User avatar
misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 49 times
Been thanked: 112 times
Serbia
misha

Re: Volvo 850 O2 sensor troubles

Post by misha » Mon Dec 30, 2019 3:15 pm

The main problem you have is that brand of sensor...RIDEX.

These cars runs ONLY on OE & Oem Bosch sensors.
Aftermarket sensors are useless in Volvos.
The car would probably run better with old o2 sensor than with new aftermarket one.

Also....when you buy a replacement sensor...it MUST have the exact same Bosch part number like old one.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Krisemann
Posts: 6
Joined: Mon Dec 30, 2019 6:13 am
Year and Model: 1994 850 2.5 144hp
Location: Norway
Has thanked: 1 time
Been thanked: 0
Norway
Krisemann

Re: Volvo 850 O2 sensor troubles

Post by Krisemann » Mon Dec 30, 2019 5:22 pm

Hmm, that's odd. I'd have to test the old sensor again, see if I get the same error.

User avatar
misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 49 times
Been thanked: 112 times
Serbia
misha

Re: Volvo 850 O2 sensor troubles

Post by misha » Mon Dec 30, 2019 5:32 pm

There is nothing odd.
They are manufactured from cheap materials,not calibrated properly to satisfy demands of the car's management like OE and OEM parts/brands.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Krisemann
Posts: 6
Joined: Mon Dec 30, 2019 6:13 am
Year and Model: 1994 850 2.5 144hp
Location: Norway
Has thanked: 1 time
Been thanked: 0
Norway
Krisemann

Re: Volvo 850 O2 sensor troubles

Post by Krisemann » Mon Dec 30, 2019 5:39 pm

Well looking into it really doesn't make it easier - check this thread out: viewtopic.php?t=45356

I don't think the sensor is the problem, but I'll test the old one tomorrow just to be sure (I replaced it because I'd get sudden power losses with thick black smoke and backfiring in surges lasting 5-10 seconds).

User avatar
misha
Posts: 4144
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 49 times
Been thanked: 112 times
Serbia
misha

Re: Volvo 850 O2 sensor troubles

Post by misha » Mon Dec 30, 2019 6:42 pm

What brand was the old sensor and what part number is stamped on it?
It should be Bosch as far as i know.
The only differrence is the type...Titania vs.Zirconia.
Titania sensors have different values....resistance...as far as i remember...
as opposite to Zirconia ones which uses voltage values.
10v cars doesn't have Maf sensor...they have IAT (intake air temperature)sensor at air filter housing.
Don't remember if 10v cars have MAP sensor...if it have...check it's vacuum line.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

Krisemann
Posts: 6
Joined: Mon Dec 30, 2019 6:13 am
Year and Model: 1994 850 2.5 144hp
Location: Norway
Has thanked: 1 time
Been thanked: 0
Norway
Krisemann

Re: Volvo 850 O2 sensor troubles

Post by Krisemann » Tue Dec 31, 2019 3:46 am

Yeah, it's Titania (10v), I wrote that in OP. MAP sensor seems to vary on where it was sold new rather than model, so I'd have to check. The IAT seems to be fine.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post