Black smoke and power loss under load on a Sorento IV diesel often point to EGR/DPF clogging, boost leaks or sensor faults.
Check EGR, DPF and boost data first — and know when to stop driving.
If your Kia Sorento IV diesel starts feeling flat under load and you see black smoke in the mirror, it's usually telling you the engine is getting too much fuel for the air it can breathe — or that exhaust gas isn't flowing cleanly. On these cars, a clogged EGR system, a sooting-up DPF, a boost leak, or a tired sensor are all common culprits. The good news is that the pattern of symptoms usually narrows it down quickly.
