I have had a 2010 Mazda CX-7 turbo-diesel for nearly 18 months now. It has the additive Adblue for emissions control. I keep the Adblue level topped up, as I was told there could be a problem if the level gets too low. Recently the SCR warning light showed on my dash, so I topped up the Adblue, but it only took two litres. After a few km the light went off. All good! But a couple of days later the warning light again showed up on the dash. I got my mechanic to look at it, and he checked my Adblue, but as I had just topped it up a couple of days previously, it was basically still full. My mechanic suggested running it for a couple more days, and hopefully the cars computer would recognize that the Adblue was full, and it would reset its self. It didn't happen, and the car has now gone into "limp" mode. I was told that if I keep running the car, it would eventually just stop. I know the Adblue level is full, and my mechanic confirmed that it was full. My mechanic phoned the local Mazda dealer and was told to take the car to them and they would reset the car computer with an up-date. The up-date would not take, and now they have said I need a new fuel tank, which includes the Adblue tank, as it is a sealed unit, and there is no fix other than a new tank. I am not getting any answers from Mazda, tried calling them, only to be told to contact the service department. Checking the Internet it seems there is a massive problem with the Adblue, but there is no mention of a fix or any way to stop the SCR warning light from showing on the dash. I find this incredible Smithy, as I am led to believe Mazda have known about this problem since 2008, but there is still no fix. The car is beautiful to drive, it runs like a dream, but now with the Adblue problem I am reluctant to keep it. I would appreciate any help you might be able to give me.
We contacted Mazda on your behalf and this is the response we received from their technical people: "It sounds like there is a bit of confusion as to what the light relates to as the vehicle is also equipped with a gauge to indicate Adblue Level. It sounds like the customer may be relating the light as a level indicator. The light can be an indication of a system malfunction of some type, this would need to be diagnosed which it sounds like may have occurred. Depending on the cause will dictate the parts required to be replaced. There are separate components and not all concerns require tank replacement. The comments suggesting there is a massive problem and the tank could go at any time are bit unfounded and sound like unfounded Internet chatter. Our recommendation would be to let the dealership perform the diagnosis and repair. If the repair is completed by a Mazda Dealer as a Retail Repair using Genuine parts the parts are covered by our Whole of Life Parts Warranty." It might not be an answer, but it does give you a guide to the cause, as the warning light might be an indicator of another problem.
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