Renault Spider Transmission Slipping

Sounds rough. I had a similar issue with my old Saab 9-5. Check engine light, slipping transmission. For me, it was the torque converter. Think of it like a slipping clutch in a manual, but filled with fluid. Before you go ripping things apart, have you checked the transmission fluid level and condition? Is it burnt or low? That could be a simpler place to start.

Good shout on the fluid check. I did check it briefly, but didn't pay close attention to its state. It seemed okay, but I'll double-check more carefully this time. When you say "acting up", what exactly was it doing? Was it throwing similar symptoms – grinding, slipping, etc.? Trying to gauge if we're dealing with the same issue.

Yeah, pretty much the same symptoms. Grinding, slipping, and the shifts felt like they were happening in slow motion. The car would also shudder at certain speeds. Ultimately, I ended up taking it to a reputable shop. They confirmed it was the torque converter on its way out. I saved myself a lot of headache and potential damage by letting them handle it. Unless you've got experience rebuilding transmissions, I'd suggest getting a professional diagnosis.

Thanks for confirming my fears. I was hoping it was something simple, but I had a feeling it was the torque converter. I re-checked the fluid as you suggested and I see some metal particles there. Off to the workshop it goes. They quoted me around 2120€ for the repair, so wish me luck. Thanks for your help!