I've ran a couple of tuning boxes on my previous diesels (not cheap tat but circa £450) and on the three different brands I've used they all ended up throwing ecu codes. Egr valve often didn't like the extra fuelling, injectors would rattle, plumes of smoke, limp mode. I opted for the box so I could remove them quickly for any warranty repairs, I wouldn't bother though.
I gave up and have since had my last four cars mapped by a tuner and had zero issues. One of my cars has covered almost 40k on a stage 1 map and is still smooth and flawless.
I gave up and have since had my last four cars mapped by a tuner and had zero issues. One of my cars has covered almost 40k on a stage 1 map and is still smooth and flawless.
