Hello together, I’m back again. Or rather, my Omega is already having problems again. Since I was so well advised by you last time, I’ll get back to you again and hope you can help me again. I’ve already read through a lot of posts but somehow didn’t find the right one. But now on the subject. My engine block lamp lights up permanently. Yesterday I was at the Opel dealer in the neighboring town. Actually because of another problem. longer sliding operation and then light gas give some of the gear lost and either after a short time or S-key hit the gear again with a jerk. However, the lamp also started with the car and fork key. Then the Omega had no more power and I had to turn off the ignition first. After the engine started again everything went again. The lamp was off again and the Omega switches again. Since I have 100,000 km on the clock, the Opel dealer recommends He didn’t want to promise me that the error was fixed. I nevertheless agreed. The fun cost was € 327,00 (Aua). So far I have only driven about 40 km and had no gear loss. But in order to be able to make a precise statement I have to drive a few km. To the engine block lamp the Opel workshop said: Probably one or both lambda probe (n) is defective. The values would change too little. can not reset the error without a new Lambda probe and would first replace the one and then possibly the second probe and then reset the error. Since the workshop requires € 197.00 per probe without installation, I first refused and thought about correcting the error myself. What I have learned so far: – there would have to be 4 probes (per cat one before and one after) – the 2 probes behind the cat are probably not quite so important (only for finer adjustment) – al 4 probes are identical (possibly a cross exchange is possible) – it would have to be a 4 cable probe – a probe varies depending on the supplier and manufacturer on the Internet from approx. € 55 to € 110 (Universal probe to Bosch probe) – the Bosch probe has the Bosch number: 0 258 006 176 But now finally my questions: – do I read my previous information correctly? – how do I find out which probe is exactly defective? (can I measure the probes with a multimeter? If yes, where and what exactly?) – does e s Makes sense to exchange both probes in front of the cat? – which probe is recommended, which rather not or are there no differences? Very important for me! Does someone have pictures where the probes sit exactly and where they are plugged in??? In advance I thank you and hope you can help me further. Greeting – Michi