If you drive a diesel registered from around 2015 onwards, there is a countdown running in your car's software right now. When it reaches zero, the engine will refuse to start — and it is legally required to.
Since Euro 6 came in, nearly every diesel car, van and lorry sold in Europe has been fitted with selective catalytic reduction — the system that sprays AdBlue into the exhaust to break down nitrogen oxides. The regulations require the vehicle to enforce its own compliance, so when the system faults, the car warns you, then limits power, then tells you how many miles remain before it will not restart. On a Mercedes the message reads "start not possible" and counts down as you drive. Once you switch it off after zero, that is where the car stays.
And it usually isn't the fluid. The most common cause is a NOx sensor — £300 to £700 fitted, and most cars have two. AdBlue pumps run £400 to £800. Tanks are often sold as a sealed module with the pump, heater and sensors built in, at £600 to £1,200. Full dealer repairs have been quoted at around £3,000, on a car that drives perfectly.
This video covers what the system actually is and why it exists, the three stages of the countdown, every component that commonly fails and what it costs, why topping the tank up doesn't fix a recurring warning, why deleting the system is illegal — up to £1,000 for a car and £2,500 for a van under the Road Vehicles (Construction and Use) Regulations, plus MOT failure and invalidated insurance — and six things you can do this week to make sure it never happens to you.
Also: why the vehicles worst affected are the ones people depend on for work, and why a cheap used diesel with this system fitted may not be the bargain the price suggests.
Has this happened to you? What was the car, and what did the garage charge? Tell me in the comments.
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If you drive a diesel registered from around 2015 onwards, there is a countdown running in your car's software right now. When it reaches zero, the engine will refuse to start — and it is legally required to.
Since Euro 6 came in, nearly every diesel car, van and lorry sold in Europe has been fitted with selective catalytic reduction — the system that sprays AdBlue into the exhaust to break down nitrogen oxides. The regulations require the vehicle to enforce its own compliance, so when the system faults, the car warns you, then limits power, then tells you how many miles remain before it will not restart. On a Mercedes the message reads "start not possible" and counts down as you drive. Once you switch it off after zero, that is where the car stays.
And it usually isn't the fluid. The most common cause is a NOx sensor — £300 to £700 fitted, and most cars have two. AdBlue pumps run £400 to £800. Tanks are often sold as a sealed module with the pump, heater and sensors built in, at £600 to £1,200. Full dealer repairs have been quoted at around £3,000, on a car that drives perfectly.
This video covers what the system actually is and why it exists, the three stages of the countdown, every component that commonly fails and what it costs, why topping the tank up doesn't fix a recurring warning, why deleting the system is illegal — up to £1,000 for a car and £2,500 for a van under the Road Vehicles (Construction and Use) Regulations, plus MOT failure and invalidated insurance — and six things you can do this week to make sure it never happens to you.
Also: why the vehicles worst affected are the ones people depend on for work, and why a cheap used diesel with this system fitted may not be the bargain the price suggests.
Has this happened to you? What was the car, and what did the garage charge? Tell me in the comments.
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