Volvo dice fixup error code P0015 on 04 S40 1.9T

I got P0015 on my 04 S40 1.9T, then with Volvo Vida 2014D, I solve the problem, to see how I solve the issue, please go on looking at the following parts.

Car model and year:

04 Volvo S40 1.9T, car only has 82k miles

Volvo vida dice diagnostic tool used:

Volvo vida dice interface, I bought from obd tools for €108.49

http://www.eobdtool.co.uk/wholesale/volvo-vida-dice-diagnostic-tool.html

Well packed without CD broken and speedy delivery, receive the package for 5 working days.

Error code read out by Vida Dice:

P0015: cam bank B over-retard

What work I check:

Checked the VVT solenoid, working fine and the gasket screen/passages are also fine. Car only has 82k miles, no big hurry for timing belt. Clearing the code using obd2 volvo vida dice diagnostic tool would work but would return next day (always). I don't know the history on the motor but I don't think synthetic oil was used.

Problem Solved:

Decided to run 3/4 quart ATF for about 250 miles (4 days) and noticed on the 4th day the cleared code didn't return. Drained the oil, put in Castrol Synthetic and a new filter. Code hasn't returned in a week (longest since I bought the car).

Looking good and a very inexpensive possible fix.

Volvo VIDA 2014 and OBDLink MX Wifi which better for Volvo XC90

Car model and year: 2013 Volvo XC90

My intent and purpose:

Read error codes and possibly in reading real time car information

Tools I am considering:

VIDA/DICE and adapters such as OBDLink MX Wifi

Question:

1. Which solution do you recommend for accessing car information and potentially for altering some car information?
2. Is one of these solutions a greater risk or more likely to cause problems?
3. Are these systems comparable or do the serve different purposes?

Answer:

1. Volvo Vida 2014 does more, the DiCE unit can access any sensor connected to the engine. Fuel pressure, MAF voltage, etc. Mx (through Obd2) only accesses sensors, but not all of them. 

2. Neither are risky except Vida dice might be if you screw up a software update. 

3. I have both, OBDLink MX is quick and dirty and can be used for any Obd2 vehicle. Volvo Vida Dice diagnostic tool takes more time to set up and is more comprehensive but is Volvo only. Mx can't access all the sensors that Volvo Vida 2014D interface can. I use both and wouldn't want to be without either one because I also drive and service other makes.

4. If it is possible to use the MX in "dumb" direct mode and it is fast enough, you can potentially write software that can do the same as Vida.
This will require information about Volvo specific communication protocols, how to ask, and how to decode response.

I would say it is better to use a plain CAN interface in stead of special hardware designed for OBD2 if you want to write your own software to communicate using Volvo proprietary protocols.