Leaderboard

Just remembered that if the battery is low the stop/start is prevented from working, so another reason for the battery to be checked but you would think the Citroen dealer would have done this before deciding the alternator needed replacing.

sound like someone has known about this fault and switched the stop/start off. economy mode can be altered using lexia and for it to be set to 3 minutes is just stupid. Paul is spot on with there possibly being a battery fault. Take it to any motorist discount store or Halfords and they will do a load test on the battery free of charge. If its a Citroen warranty on the car then you can take it to another Citroen dealer who can maybe do it quicker

Only 2-3 minutes before economy mode kicks in is a sign of a battery that is not charged. On our C4 it is a lot longer than that, more than enough for a motorway lunch stop with the radio on and the engine switched off. If you have a volt meter check the battery voltage, should be about 12.7 volts before the engine is started.

I think the alternator may start the engine when in stop/start mode so is not an ordinary one and is expensive. You could check the battery voltage to see if it is still charging the battery, if it is and the voltage is low then possibly the battery may be due for replacement as well unless you are only doing short trips. The stop/start may be a good idea to reduce emisions in towns but it can be at a high maintenance cost which wipes out any possible fuel cost savings, just as well it failed when under warranty since it may be in the high £100s to replace. Similarly the battery is a special one that seems to be a few £100. I do not know if it will affect the exhaust particulate filter either. Our C4 has stop/start and I am reluctant to use it since I do not think it will do the car any good long term. I have edited your profile to add your car details to save you mentioning it every time in a new topic.