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Wideband guage...

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Wideband guage...

Post by EmersonS70t5m » Thu Apr 18, 2019 3:11 pm

So, trying to install a wideband sensor, and I dont know what wire to spice to the 5 wire Bosch 02 sensor I have. The guage has one sensor wire off the back. I've tryed a few different wires but still cant seem to figure it out.



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Re: Wideband guage...

Post by RickHaleParker » Thu Apr 18, 2019 5:43 pm

Five wires? ..... Sounds like your tapping the wrong sensor. O2 sensors are four wires. Two for the heater, two for the sensor.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 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.
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Re: Wideband guage...

Post by bmdubya1198 » Thu Apr 18, 2019 9:13 pm

The upstream O2 sensor on the Motronic 7 cars has 5 wires. I believe M4.4 and older sensors have 4 wires.

From what I've read, you can't use the stock "wideband" Bosch O2 sensor with an AFR gauge. I don't know exactly what the issue with it is, but I think it has something to do with the type of wideband gauge that it is. It's designed to communicate with the ECU, but not give specific readings that would be useful for air to fuel ratio info.
Do a Google site search on Volvospeed. There are a few threads over there that talk about this.


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Re: Wideband guage...

Post by RickHaleParker » Thu Apr 18, 2019 10:00 pm

ME7 emissions for 2000 S70. I could not find emissions in the 1999 EWD.
Next question is: Which wire does he need to connect his black wire to?
7/15 and 7/82 are the O2 sensors.
2019-04-18.png


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 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.
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Re: Wideband guage...

Post by abscate » Fri Apr 19, 2019 5:09 am

You might find the outputs tabulated on the Bosch site if you scour the webs

It looks like the O2 sensor output I still com8ng over A41 and A42


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Re: Wideband guage...

Post by bmdubya1198 » Fri Apr 19, 2019 7:40 am

From what I've read you need to tap into the black wire. I'm assuming the one coming from the O2 sensor and eventually leading to A41.


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
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1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

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Re: Wideband guage...

Post by abscate » Fri Apr 19, 2019 9:14 am

I completely messed you up. I think the upstream OXS is a wideband which does not toggle between 0.5V, so that post is internet fake news.

SCope traces for a wideband are probably on the picoscope website


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Re: Wideband guage...

Post by abscate » Fri Apr 19, 2019 9:25 am

RickHaleParker wrote:
Thu Apr 18, 2019 5:43 pm
Five wires? ..... Sounds like your tapping the wrong sensor. O2 sensors are four wires. Two for the heater, two for the sensor.
ME7 five wire OXS for the upstream one..Bosch 15667

Yellow is OXS Ground
Black is OXS signal


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Re: Wideband guage...

Post by RickHaleParker » Fri Apr 19, 2019 9:51 am

To figure this out we would need to know what Wideband Guage he is installing and find the instructions for it.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 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

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Re: Wideband guage...

Post by bmdubya1198 » Fri Apr 19, 2019 11:06 am

If he's using an aftermarket wide band O2S with a gauge, you can't use that in place of the stock upstream O2S. ME7 certainly won't like that.

The correct way to do this would be to weld a new bung into the downpipe to use the wide band sensor.


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

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