Still we claim a Post cat O2 switching yet no P0420 is set. Something is amiss here ?

Christiaan

That scope trace is not what one would expect.

What is the issue with the car - Fault codes, symptoms etc. would be a big help.

So in conclusion I believe there is something wrong in that circuit. But is it the coil, wiring, the driving transistor or the MCU?

You would get more value if you added an amp clamp to one of the wires. Then you would see the command and the component reaction.

RYM Unlikely but not impossible. With the post cat O2 switching the Cat has failed and that O2 is warm enough to switch. A big "maybe" but never say never ! My knowledge and understanding is that P0420 should & will be present. In this case it is not. Front oxy sensor signal wire shorted to rear oxy...

Back on topic the lambda sensor 2 is working according to the pids, switching high and low, which is wrong if the CAT is working correctly. Then P0420 is present or you or your Verus Guide to the Galaxy is telling lies. Period. O2 S2 switching high and low, with a heater Circuit Fault and still swit...

the lambda sensor 2 is working according to the pids, switching high and low, which is wrong if the CAT is working correctly.

Then P0420 is present or you or your Verus Guide to the Galaxy is telling lies. Period.

RYM I like STC I really do. He has helped me out. Thank you and always a pleasure :) :) give them advice on what they should do next and the mistakes will be kept to a minimum Here we will disagree !!! What if they don't have the correct tools ?? - My angle is to buy the tool or move it on ! If one ...

Not many people in my place ever use it really so there isn't much to learn from anyone in the workplace. I'm a bit of a Volvo geek myself, have an XC90 and looking for another C70 T5. Had one a few years back and miss it. A very good Friend is a Mastertech at the Dealer in Slough, I have Vida/Dice...

Hi Sk In England Volvo Franchises are issued with a 2 channel scope. Is that the case in Ireland or have you invested in your own ?? There are at least 22 VMs issuing Picoscopes to the workshops. Do we have one contributor on the Forum that is a full time VM Technician using a Company Issued OEM Pic...

Hello Again Victor with both camshaft sensors disconnected the starter is engaged only for 1 second (maybe some protection disable the normal operation). Maybe consider this: http://www.scantool-direct.co.uk/automotive-sensor-simulator-and-tester-327-p.html Use it to confirm deny the theories. I hav...