jkk Posted April 15, 2019 Share Posted April 15, 2019 Hi, just wondering if anyone can help ... My mk 4 mondeo has just started to refuse to lock - either by the key fob or via the door lock... it locks then instantly unlocks...... i did change the door panels a few weeks ago..but cant see anything wrong with fitment that would cause this. Quote Link to comment Share on other sites More sharing options...
Dee_82 Posted April 16, 2019 Share Posted April 16, 2019 it might be a dodgy solenoid on one of the doors. I had a similar thing happen, it would lock if I hit the unlock button first then the lock button but ive heard of all sorts of issues. basically the solenoid gets gummed up, clean it up and all was good. It might be nothing to do with your issue but its a possibility. 1 Quote Link to comment Share on other sites More sharing options...
frund Posted April 16, 2019 Share Posted April 16, 2019 Had exactly same problem with my partners car MK6 fiesta. After checking door to A frame harness I opened door and sprayed the lock mechanism from all angles using WD40. Use lots of this stuff and it will run out of the bottom of the door. Work lock many times and do it again, lots of WD being used. ( wish i had shares ho ho) It is often the door closed switch which is in the lower part of the door lock. After doing this a few times leave for a week and spray with Silicone grease or liquid grease. hope this helps Quote Link to comment Share on other sites More sharing options...
kevinswithenbank Posted April 26, 2019 Share Posted April 26, 2019 KEY FOB battery LOW, THIS HAPPENED TO ME WITH A MICRA, REPLACED battery AND IT WAS FIXED. Quote Link to comment Share on other sites More sharing options...
kevinswithenbank Posted April 26, 2019 Share Posted April 26, 2019 suggested this as I start with the easiest things first, battery replacement is a lot easier than a door card removed and solenoids checked, probably wont be the battery but its worth trying, Quote Link to comment Share on other sites More sharing options...
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