Hello! I own a DS 7 (2023) 1.6 turbo petrol (225 HP). I have noticed for a few days that when I start the engine, it takes longer to warm up to the minimum limit, until the revs start to drop. This happens even in the underground car park, where the temperature is +17-18 degrees Celsius. Until now, it took a maximum of 30 seconds for the revs to drop, now it takes 1-1,5 minute. The only thing I can link this to is the recent first spark plug change at 30.000 km. Or maybe this could be related to a change of the ECU algorithms? Has anyone else encountered this situation? Thank you!
This is the case if new engine ECU software has been installed.
Previously it was probably 800-900 rpm quickly, but after uploading new soft it is 1200-1300 for 1.5 minutes.
I had the same thing in a C5 Aircross 225 petrol.
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Thank you! I’m just wondering what could be the arguments/Pro’s of such a change in the ECU. I’m used to start driving only after the revs go down, so now it’s a little uncomfortable for me to wait longer. 
Ok, I just used the GPT to help me. Here are some aruments:
Possible reasons for longer high-idle after a cold start (post-ECU update):
- Emissions control: Faster catalytic converter warm-up to reduce cold-start emissions.
- Engine stability: Smoother combustion and idle consistency until sensors reach optimal temperature.
- Mechanical protection: Quicker oil circulation and reduced wear or condensation in early seconds.
- Regional adaptation: Improved reliability in varied temperatures or humidity conditions.
- Software calibration: Updated strategy for better uniform performance and fewer customer complaints.
You are not alone on that. My E-tense 300 does the same, but only when not used for 4 or 5 days
This topic only applies to the petrol engine 180/225HP, not the e-tense. The e-tense is different despite having the same combustion engine.