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1

Omega General Help / Re: crank speed sensor

« on: 20 October 2025, 15:46:10 »

Assuming you actually have a failed crank sensor then the best way to be sure about which part is required is to pull it and have a look. There are three sensor variants, one with a rectangular sided plug and two with oval sided plugs, on the sensor tails. All three sensors may fit the engine however they have differing electrical resistance.

As your engine is a 1997 V6 then the sensor required is probably, but not certainly, Bosch 0261210131 aka GM# 90540743/Opel Kat 12-38-740. The Vauxhall/Opel EPC can't be trusted for these sensors. However the sensor will usually have a Bosch logo and the Bosch part number embossed. Some will also have the GM part number stencilled on. Just make sure wherever it comes from that it's a Bosch part with the Bosch number on it.

This sensor also has an associated "Production" part number, lots of Opel parts do. This is 90494182, which is also used as the spare part number for Cadillac Catera and Saab V6. 90494182 is not a supersession, it's still the same Bosch 0261210131 and the part in the package will say 90540743, if you can find one. 

The sensor, if indeed it's still being manufactured, won't be made in Germany. I seem to recall they're from Slovenia or maybe Romania. And it's this sensor you will get if you can place a special order through a Vauxhall dealer.

2

Omega General Help / Re: Fuel level tank

« on: 07 September 2025, 14:16:46 »

What happens when you fully fill the tank? Does the fuel gauge read full, or just under?

3

Omega General Help / Re: x25xe wont start on my 1998 omega b

« on: 27 July 2025, 14:01:16 »

What's the Delphi part number? Might it be SS10809?

In that case it is an incorrect part. The resistance is incorrect @ 0.59kΩ. The original Bosch part has a resistance of 0.86kΩ.

The correct GM part # for your car should be 90540743 which is Bosch part  0-261-210-131. A factory original sensor will have both those numbers on it. Sometimes GM parts also have a parallel factory production part number, in this case 90494182. Cadillac and Saab use the factory production part number as the spare part number, but it's still the same Bosch 0-261-210-131. This sensor has an oval sided connector.

So have a look at the sensor you removed in the first place, if you still have it? I expect you'll see a Bosch logo and 0-261-210-131 on it.

Be aware that Bosch no longer manufacture these sensors in Germany. They are now made in Slovenia, if they're still made at all. Even the GM special order ones that were available until a few years ago are the Slovenia parts.

4

Omega General Help / Re: speedo/rpm per mph

« on: 16 July 2025, 20:06:56 »

Something seems to be wrong. If your actual speed is 30mph then the speedo, in the car, should read 30 mph or over. Not 25mph. The speedo is not allowed to under read/indicate the actual speed.

5

Omega General Help / Re: Massive Clattering Noise

« on: 10 June 2025, 11:12:49 »

What make and model of timing belt kit did you use?

6

Omega General Help / Re: Oil Leak around Oil Filter Area, V6, Y26SE

« on: 07 June 2025, 18:21:44 »

Might be GM# 9240161 Opel KAT 56-50-761.

7

Omega General Help / Re: K015453XS GATES and V6 Y26SE Timing Belt Rear Cover

« on: 28 May 2025, 16:39:00 »

Contitech CT990K1 is correct for your car and has the correct backplate. The Gates equivalent is  K025453XS. Engine numbers 08300419 to 08578511.

Contitech CT884K1 is for C25XE and X25XE/X30XE. The Gates equivalent is K015453XS which seems to be what you have received. These kits are for engine numbers up to 08300418. The original backplates on these engines have the letter "D" moulded into it. The rollers on the "D" backplate were subject to failures which did not go down well in the USA. Post model year '97, there was a mandated retrofit update to the backplate, upper idler and the tensioner and a strengthened drive belt. These redesigned backplates have E or E1 or E2 moulded into them. That's the reference in Haynes.

You should not reuse a "D" backplate. Any of the "E" versions you can swap over the upper idler and tensioner to get the assembly to fit.

You should also be able to use Contitech CT990K2 or Gates K035453XS kits. These are for later Y26SE/Y32SE (and Z32SE not used in Omega B), engine number 08578512 onwards. This has a lower idler roller without any eccentric adjustment.

8

General Discussion Area / Re: Word Association.

« on: 15 May 2025, 16:41:51 »

Bazaar

9

Omega General Help / Re: Crankshaft sensor question.

« on: 23 April 2025, 12:49:10 »

There are three different crank sensors for the V6's. All three have different resistances.

90492006 is 550Ω. It has a square sided connector and most V6 cars have an oval sided loom connector. So it will fit in the block just fine but you can't connect it. And no, you can't just cut and splice splice the loom off your existing sensor because the resistance in the sensor head is incorrect. My guess is that these are early Calibra sensors.

90492061 is (circa) 720Ω is the early iteration of the oval connector sensor. Supposedly used on some early X25XE. Information on EPC is incorrect.

A 2.6/3.2 is much more likely to use 90540743 aka Bosch 0-261-210-131. The sensor head might also be stamped with a factory production number 90494182.  Cadillac and Saab use the factory production part number, it's still the same Bosch 0-261-210-131. This sensor has an oval sided connector and a resistance of 900Ω.

10

Omega General Help / Re: V6 Camshaft Sprocket Bolt Renewal and How to Prevent Sprocket Rotation

« on: 07 April 2025, 16:13:56 »

Try a Saab specialist. The Saab V6 (B308) must use the same bolts. You might strike lucky.

11

Omega General Help / Re: Diff ratio. How to identify.

« on: 28 March 2025, 13:36:04 »

There should be an ID tag on the bottom of the diff. The ratio should be at the bottom right of the tag. Something like 38:9=4.22.  That said given the age of these diffs the ID tag might well have disappeared.

12

Omega General Help / Re: UK police spec gear lever.

« on: 23 March 2025, 14:00:15 »

Does you car have the Police gearshift?

Regardless it seems to me that you need part number 5 from your drawing, "GM# 90435930 / Opel KAT 7-38-768 Collar, reverse gearshift lever (NLS-No Replacement Part)". And that part seems to be the same on all the manual gearshift levers.

Since it's NLS (No Longer Serviced) and No Replacement Part it likely went out of production in 2003. So you might struggle to find a new lever assembly or the reverse collar on it's own.

I suggest  you put up a part wanted message in the Test Zone of the forum and hopefully the Admin will move it to the correct Car Parts, bits For Sale & Wanted section.

13

Omega General Help / Re: UK police spec gear lever.

« on: 22 March 2025, 18:35:35 »

Seems to me that the UK Police spec gear lever assembly has the same part number as the standard version without leather (trim?). IE GM# 90436516 Opel KAT 7-38-124. And this assembly was only used until chassis S1127872. The S indicates Model Year 1995. Your car is much later

GM# 90436517 Opel KAT 7-38-173 would seem to be the lever assembly fitted to all manual cars after MY1995 and had leather trim. So that's likely your car.

Good luck finding one. Have you dismantled the gear lever to see why the reverse pull-up isn't working?

14

General Discussion Area / Re: Word Association.

« on: 22 March 2025, 13:16:04 »

Contract

15

Omega General Help / Re: Massive Clattering Noise

« on: 20 March 2025, 21:57:04 »

Well done!

You've mentioned installing a new belt. What about the idler rollers and the tensioner? Are they being renewed or just the belt?