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[STEMO]

No, second key is nowhere near the key ring...It ruins the purpose of second key🤷 I'll check the immobilizer ring when temperature ouside rises a bit. Second key was made by local locksmith, transporder chip was easy to duplicate and it was cheap to make. But it works.
First on to do list is leaking HBV tomorrow...priorities, then all the rest, neverending I guess

If other key works consistently but the first key doesn't, haven't you already found your issue?

Or have I misunderstood something?

It may have been lost in translation, but yes. Any other car key with a similar transponder signature can potentially cause an issue.

So any transponder key NOT for.the Omega on the same key ring could cause interference.

Also lots of keys and a slightly worn ignition switch might just alter the position of the chip in relation to the transponder ring enough to disrupt it.

Lost in translation between two people that speak the same language 😂

What Jaime was saying is, if one key works and the other doesn't, it's the key.

[Doctor Gollum]

That's true if it is the only key any where near the ignition.

[TheBoy]

On the Omega, I've never really had an issue with multiple GM keys on a single bunch, as long as the one in the ignition switch is correct. And I suspect I've tried a bigger bunch of them than many

But its not ideal to do that though, especially when diagnosing transponder issues.

[danzigfan]

It happened again today, so I tested spare key as mentioned..It doesn't work. It took half an hour for engine to start again. Key out, lock/unlock open door...doesn't matter...No start, only cranking. EML stopped flashing after half an hour and then it started.
So at least I know the problem is not the key

[TheBoy]

So remove the steering cowling and check the connector to the ring around ignition. Also, check if a previous owner has selleopated a transponder in this area (surprisingly common because some people didn't want to pay to get the transponder programmed when they needed a new key)

[danzigfan]

Thanks...will check tomorrow 

[danzigfan]

And another thing...I noticed this problem occurs only when engine is hot. Lets say I went to a store, few minute passes, it won't start. As soon as it cools down a bit, it starts...or it seems so.
Should my next step be crank sensor?
Although flashing EML is immobilizer smptom

[TheBoy]

Flashing EML means it won't even attempt to spark/fuel, so crank sensor shouldn't come into it.  Although all V6 Omega owners should carry a spare sensor and E8 (from memory) socket in the boot!

[danzigfan]

New day, new problem...urgent help please

[danzigfan]

Eml isn't flashing anymore but the car doesn't start.
Got codes 12
                   31 - no engine RPM
                  144 - Immobiliser No Signal

Crank sensor?

[Doctor Gollum]

What is the ECU coolant temperature showing?

[danzigfan]

I can tell you only for gauge temp, sory. Shows cold

[Doctor Gollum]

I can tell you only for gauge temp, sory. Shows cold

Not much help. Basically, if the ECU temp sender has failed and defaulted to -40°C then it will try to start with the injectors maxed out. This floods the engine and you'll never get it running once it's warmed up.

Pull fuse 18 and crank it several times. You might find it fires. It it does then you need a new ECU temp sender.

[danzigfan]

Thanks, will try it now

[danzigfan]

Still nothing. Only cranking, no start