Mondeo AdBlue Error No Start

Hi, I'm having a nightmare with my 2015 Ford Mondeo diesel. It's got about 225k km on the clock. Recently, I've been getting an "AdBlue tank empty" error message. Even after filling the AdBlue tank, the error persists, and now there's an error stored in the error memory too. To make matters worse, now the engine won't even start! I've done a bit of research and it seems like the AdBlue output from the tank to the dosing unit might be defective. Has anyone experienced something similar? I'm trying to avoid a huge bill, but I'm starting to think a visit to the workshop is inevitable.

4 comment(s)

Ugh, sounds frustrating! I had a similar issue with my old Renault Espace, although it wasn't exactly the same. I kept getting a service light related to the diesel exhaust, and it turned out the SCR catalyst was playing up. It wasn't an "AdBlue tank empty" message specifically, but the symptoms were similar – persistent error message and eventually, limp mode. Have you checked the DEF fluid lines for any blockages or leaks? That might be worth a quick look before you take it in. The tank capacity is probably fine, it's likely a sensor or delivery issue.

Thanks for the insight! I haven't checked the DEF fluid lines specifically. Where exactly are those located, and is it something I can easily access myself? I'm reasonably handy, but I don't want to make things worse. Also, did you manage to fix the issue with your Renault yourself, or did you end up taking it to a mechanic?

Okay, so on the Espace, the lines were a pain to get to – tucked away near the exhaust. You might have better luck with the Mondeo, but honestly, unless you're super confident, I'd be wary of messing with them too much. I ended up taking the Renault to a workshop because I didn't want to risk damaging the SCR catalyst further. Given that your engine won't start now, I'd seriously consider getting it checked professionally. It sounds like more than just a simple sensor issue.

Thanks again for sharing your experience! I think you're right; it's beyond my capabilities at this point. I've booked it in with a local mechanic. Turns out the AdBlue pump was faulty, and they're quoting me around 250€ for the repair. Hopefully, that'll sort it out!

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