Renault Arkana Owner Seeking Advice on Black Smoke Emission, Check Engine Light, and Power Decline

Hey there, I totally get your situation. Faced something similar with my 2019 Renault Scenic a while back. From your symptoms, it does sound like a lambda sensor issue. That black smoke and the power drop points towards an improper air/fuel mix, which is often linked to a faulty lambda sensor. In my case, I initially got a consistent check engine light like you, followed by weird noises under the hood. Took the ol' gal to my garage and the diagnostics pointed out a malfunctioning lambda sensor. The sensor regulates how your engine burns fuel, so if it's defective, you may experience issues like you're having. Now, it's not a catastrophic problem, but it's not something you want to ignore, either. It can cause deterioration over time, like a costly damage to your catalytic converter. A good mechanic should be able to replace the sensor without much hassle. It made a world of difference for my Renault. So, I'd recommend getting it checked with a reliable mechanic ASAP. Nothing to lose sleep over, but you'll definitely want to get it looked at soon. All the best with it!

Hey! Cheers for the detailed insight. Truly appreciate you sharing your experience. I kinda suspected the lambda sensor could be the culprit. I plan to get my Arkana checked out pretty soon. By the way, do you happen to recall what the sensor replacement set you back by and did you find any more issues related to this since the replacement? Just want to get a rough idea about potential costs involved. Thanks a ton!

Hey, no worries at all! Glad I could help. As for the cost, when I went to my mechanic about the lambda sensor, it came up to about €375 to get it sorted. Honestly, it was a good investment for the peace of mind. And I'm pleased to report that since replacing the sensor, I haven't had any more of those troubling exhaust aftertreatment problems. My Renault's been running like a dream. So, it might not be fun to fork out the cash, but it's better than more serious problems down the line! Best of luck with your Arkana!

You're a lifesaver! €375 sounds reasonable for peace of mind, indeed. It seems like it's worth the try. Great to know your Renault is doing fine post-replacement. That sure gives me some hope. Will get my Arkana looked at soonest and fingers crossed, hope it solves the problem. Thanks tons again for all the helpful advice. Really appreciate it! Take care!