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Without being able to view it and hear it firsthand it's hard to suggest what might be wrong. It could be a bearing in the turbo, but that's only an educated guess. I would have a mechanic check it.
They are indicators that show work was done on the differential, but they're not anything should be on concern. Cars have all sorts of marks on them from production, they usually indicate a check has been done along the way.
The current model Nissan X-Trail is the third-generation of the popular soft-roader and was initially unveiled in 2013. The range was updated for the 2017 model year with a thorough facelift, which should see it through to an expected replacement date of approximately 2020 - possibly debuting in mid-to-late 2019.
The radio reception in Hyundai cars has been a regular compliant over the years, and there's never been a satisfactory solution. Being a relatively new car I would persist with Hyundai and request a replacement head unit as a gesture of good will. I think Hyundai would be crazy to refuse you and risk damaging its reputation.
Pop out the side trim panel next to the centre console using a plastic trim removal tool, and then remove the plastic trim surrounding the gear shifter console. There is a T20 Torx bit holding the back of the shifter trim down, so remove that. Pop off the trim panel above the temperature and fan controls (housing the passenger airbag warning light), then disconnect the wiring connector for the passenger airbag warning light. Remove the four T20 Torx bits holding the fascia to the car, then put the car into Drive (or 2nd gear if a manual), pop up the gear shifter boot, then pop out the rest of the shifter and fan control plastic trim. Pop the radio and vent panel out by pulling on the opening under the hazard light button, then unplug the radio wiring.
The radio unit is held in by two T20 Torx bits.
There were two models in 2009, the S and the SX. The S didn't have ESP (stability control), but the SX got ESP with the MY2009 upgrade in October 2008.
Ford Focus four-door sedans are 4538mm long, while the five-door hatch comes in slightly shorter at 4360mm for the Trend, Titanium, and Sport, and the ST's bodykit pushes this model to 4362mm long. The body-kitted all-wheel-drive RS model is longer again at 4390mm.
There are three engines available in the 2018 Kia Sportage: a 2.0-litre four-cylinder petrol engine with 114 kW in the SLi, Si Premium and Si, a 2.4-litre four-cylinder petrol engine with 135 kW in the GT-Line, and a 2.0-litre four-cylinder turbo-diesel engine with 136 kW.
Walk to the rear of your car and look directly at the back. Near the right-hand taillight should be a badge telling you which model you are looking at. This will either say, Trend, Titanium, Sport, ST or RS. The Focus range runs from the Trend at the bottom up to the sporty ST, with the high-performance RS standing out on top.