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[omegod]

Anyone able to provide an accurate point/year at which the plugs changed from rectangular to oval shape please    V6 model ideally

[Enceladus]

There's two different sensors with the oval plug. And one with the square sided plug. All three have different resistances and are not electrically interchangeable even if it physically fits.

Compatibility depends on the version of the Bosch Motronic ECU fitted. The only way to be certain which sensor is required is to get the part numbers from the original.

If your V6 is a Model Year '97 spec onwards then the most likely sensor is GM# 90540743 / Bosch 0261210131. MY '97 spec cars were first produced in July 1996. This sensor is also the only one used on 2.6 & 3.2.

Please post up any numbers from your existing sensor.

[LC0112G]

EPC says...

90492006 for all V6 up to engine number 08149313
90492061 for  X25XE from engine number 08149314 onwards
90549743 for Y26XE, X30XE and Y32XE from engine number 08149314 onwards

Thing is, since the mating plug is part of the body loom, it's also got to be dependent on chassis number, and there is no info on that in EPC.

So as Enceladus says, safest way to find out is to pull the out plug out and take a looksee. Yes I know that's not as easy as it sounds.

[Doctor Gollum]

How do the break points compare to the engine loom and ECU part numbers?

Engine loom isn't part of the body loom. It connects to it via a the white round plug...

[LC0112G]

How do the break points compare to the engine loom and ECU part numbers?

It just turns into a rabbit hole of investigation....
X25XE = BOSCH 0261203271 = IDENT PR, CHASSIS R1000001-S1035396
X25XE = BOSCH 0261203588 = IDENT HH, CHASSIS S1035397 -
X25XE = BOSCH 0261204463 = IDENT LF (leaded fuel so probably not relevant)
Y26XE = BOSCH 0261206965
X30XE = BOSCH 0261203273 = IDENT PS, CHASSIS R1000001-S1035396
X30XE = BOSCH 0261203589 = IDENT HJ, CHASSIS S1035397-V19999999
X30XE = BOSCH ? = IDENT AF, CHASSIS W1000001-
Y32XE = BOSCH 0261206965 = IDENT ??

Engine loom isn't part of the body loom. It connects to it via a the white round plug...

Ok, what I meant was that some components have chassis number breaks, and others have engine number breaks, and some of them should probably have both, but don't.

[Doctor Gollum]

Engine ecu should match the sensor... And therefore the engine number...

[LC0112G]

Engine ecu should match the sensor... And therefore the engine number...

Perhaps, but EPC lists ECU by Chassis Number not Engine number, and Crank sensor by Engine Number not Chassis Number. Which was my point.

OP was asking for Chassis Number to Crank Sensor break points, which may be possible to work out but isn't easily available. 

One might wish to conclude that Engine numbers up to 08149313 were fitted to cars with chassis numbers up to S1035396(or V1999999), and therefore use crank sensor 90429006, and Engine numbers 08149314 were fitted to cars with chassis numbers after S1035397(or W10000001) and therefore use crank sensor 90492061/90549743. I'm not brave enough to make that assumption when buying the wrong part is going to set you back the best part of 100 sovs. 

[grifter]

Is the part number on the sensor body?

[Doctor Gollum]

Usually, but they tend to be painted on, so clean it carefully.

Being a 2.6, there should only be one choice...

[grifter]

Usually, but they tend to be painted on, so clean it carefully.

Being a 2.6, there should only be one choice...

Is that like the ford model T paint colour? Any choice as long as it's black!

I'm planning to be using car for long trip this summer so want to change the sensor as a matter of course. Never had an issue with the rank sensor on any of my other cars but I'm not taking the chance.

[Doctor Gollum]

Looking at Enceladus' detailed post,

Facelift 3.0, all 2.6/3.2 use the same sensor.

So either you're over thinking it, or you're overthinking it. 

[grifter]

Looking at Enceladus' detailed post,

Facelift 3.0, all 2.6/3.2 use the same sensor.

So either you're over thinking it, or you're overthinking it. 

Excellent, I'd remembered I bought one a while back, dug it out my loft, it's 90540743, so good to go!

[Enceladus]

EPC says...

90492006 for all V6 up to engine number 08149313
90492061 for  X25XE from engine number 08149314 onwards
90549743 for Y26XE, X30XE and Y32XE from engine number 08149314 onwards

Thing is, since the mating plug is part of the body loom, it's also got to be dependent on chassis number, and there is no info on that in EPC.

So as Enceladus says, safest way to find out is to pull the out plug out and take a looksee. Yes I know that's not as easy as it sounds.

I know that some versions of EPC list those breakpoints. However part # 90549743 was already being used on X25XE and X30XE prior to engine 08149313, so there must be some other factor. I suspect it's when production of MY 1997 (character V in position 10 of VIN) commenced production in July 1996. Also these cars had the oval plug on the loom. Production of vehicles to the MY 1996 (character T in position 10 of VIN) specification may well have continued in parallel into 1997 so perhaps these cars still had the earlier sensors.

I seem to recall that when I first went to a dealer to get an Omega V6 crank sensor I was told the only way to be certain of getting the right part was to pull the old one. The same was true for the coil pack. And I seem to recall that the same advice was on the ABS site.

There's been several instances on the forum where customers have had incorrect sensors supplied from a Vauxhall dealer. And they haven't worked. And as one member discovered nor does splicing the rectangular socket onto an oval version.

[cam.in.head]

there  was also a mod mentioned on here regarding using a (vectra i think) sensor which is a socket type output rather than cable and then presumably using the cable/ socket from a vectra too.

[Enceladus]

there  was also a mod mentioned on here regarding using a (vectra i think) sensor which is a socket type output rather than cable and then presumably using the cable/ socket from a vectra too.

Yes indeed there was. Member Vega in the Netherlands who is still active on the forum. Adapted the crank sensor intended for a Z32SE V6 in a Vectra. The thread is here, alas the photos don't work.

The GM part # for the Vectra sensor is 9198639 which is Bosch 0261210206.