Seeking Advice for 2016 Nissan Patrol Diesel: Problems with Black Smoke, Starting Difficulties, DPF Issues, and Shaking at Idle

Hey, sounds like I've had something similar with my 2014 Nissan Navara. Just to give you an idea, I've got some experience with cars, but I'm no professional mechanic, you know? Turned out the wiring harness from my glow control unit to the digital diesel electronics was damaged. So, it wasn't too far off from what you suspected. I took it down to my local workshop, a place I trust. They had a look, confirmed my hunch, and managed to get the whole thing sorted out in no time. Ran me about 155 Euro, but hey, better than having a car that barely runs, right? What I would recommend is you get that checked out. Does your ride have any other symptoms or quirks you've noticed lately? A little bit more info could help me give you a stronger steer. Cheers.

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Hey, thanks for getting back to me. Yeah, I did notice something odd lately. My Nissan Patrol seems to be burning through fuel faster than usual – and I mean quite significantly faster. I just chalked it up to the colder weather initially, but now with these other issues coming up, I'm not so sure. The mileage is currently at about 60712 KM, not that high considering it's a 2016 model, but never had these problems after the latest service. I suppose it's possible the issue could be similar to what you experienced with your Navara, I'll definitely look into getting the wiring checked out. Any thoughts on the fuel situation, though? Thanks again, I really appreciate your help.

(Translated from German)

No worries! Here's the thing, that increased fuel consumption you're noticing could actually be related to the other issues you mentioned. If your DPF isn't regenerating, there's a good chance your Patrol is automatically running post-combustion injections in an attempt to increase exhaust temperatures and force regeneration. That would explain the black smoke and the poor fuel economy quite nicely, as well as why the thing isn't starting - the diesel's likely draining into the oil sump, raising your oil levels and thinning its consistency. This could eventually mean serious engine damage, so it's definitely not something you want to sit on. Just to give you some context, I had a similar sort of issue a while back where my Navara was guzzling diesel like there was no tomorrow. Turned out to be a fault in the vehicle's fuel pressure regulator, nothing too major but it had quite the impact on the fuel economy. However, given the other symptoms, I wouldn't rule out a faulty wiring harness or even an issue with the diesel injection system. Either way, it sounds like there's a clear need for a professional inspection. Try and get that sorted at the double, because I'm not fond of the idea of your patrol becoming an oversized lawn ornament! And do remember to keep us updated, yeah? It helps the rest of us learn and we've all got our fingers crossed for you! Good luck!

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Hey there, thanks for the great advice and the detailed explanation. I think you might be on to something with the DPF not regenerating and the fuel consumption issue being related. Now that you mention it, I did notice the oil levels seemed a bit high the other day. You're right about not sitting on this, it sounds like it could turn ugly fast if it's not addressed soon. I'll get the Patrol to a workshop straight away and have them check out the things you suggested. Who knows, maybe it's the pressure regulator or the diesel injection system, like you said. Either way, I'll keep you guys posted on what happens. Thanks again for the help! I really appreciate it. Cheers!

(Translated from German)