I have 225/55/16 on my 2.0L GLS, but can not find a definitive answer to the correct pressures, the manual lists by engine starting with 2.2 haynes talks a lot about 2.0L but again does not mention it as a seprate list.  So what would the team suggest?

Have you tried here?
http://www.kwik-fit.com/tyre-pressure-search.asp

There should be a sticker inside your fuel flap showing tyre sizes and pressures
hth :y

rob in gib wrote on 29. Aug 2011 at 13:12:

There should be a sticker inside your fuel flap showing tyre sizes and pressures hth :y

no just one telling you not to use diesel

alexw wrote on 29. Aug 2011 at 13:05:

Have you tried here? http://www.kwik-fit.com/tyre-pressure-search.asp

Sorry ca not find you vehicle  :(

alexw wrote on 29. Aug 2011 at 13:05:

Have you tried here? http://www.kwik-fit.com/tyre-pressure-search.asp

Tried this and wouldn't trust it one iota.
Gave exactly the same pressures for both the Estate and the Saloon - and these were incorrect!!  Sums up KwikFit >:(

Any good to you?
http://www.tyre-pressures.com/ByCar/VAUXHALL/OMEGA/4+DOOR+SALOON+-+4+SPEED+AUTOMATIC+-+PETROL/16V+GLS/1998/94+APRIL

Bob G wrote on 29. Aug 2011 at 12:46:

I have 225/55/16 on my 2.0L GLS, but can not find a definitive answer to the correct pressures, the manual lists by engine starting with 2.2 haynes talks a lot about 2.0L but again does not mention it as a seprate list.  So what would the team suggest?

That will be the facelift manual.  The 2.0 engine is covered in the pre-facelift manual tyre pressure page in the FAQ section of the forum:

http://www.omegaowners.com/forum/YaBB.pl?num=1176583378

Looks like its the same as the 2.2 anyway - 30 all round.  :y

Strange even though the car is a facelift, still 30 all round is nice and easy 8-)

Used to have same tyre size on my old 2.2 and found 32 all round suited me best.