What are the symptoms of old fluid
What are the symptoms of old fluid — usually nothing you can feel — a dosing or NOx conversion fault appears, often after several driving cycles.
Call 01293 248666 Call-out from £89
What are the symptoms of old fluid — the context
Urea in solution is not indefinitely stable. It hydrolyses slowly to ammonia and carbon dioxide, and the rate rises sharply with storage temperature — which is why manufacturers quote shelf life against a temperature band rather than a flat date. Fluid stored warm for a long period, or in a part-used container that has been opened repeatedly, drifts below the 32.5% concentration and can also develop elevated biuret. The result is quiet under-dosing rather than any dramatic symptom.
Expired AdBlue degrades as urea slowly hydrolyses to ammonia, so the concentration drifts out of specification and the system under-doses. It is one of the cheaper faults to put right — drain, flush and refill. Call 01293 248666.
| Topic | Expired AdBlue |
|---|---|
| Severity | Recoverable Normally put right by a drain and flush, provided the engine has not been run. |
| Typical cost | Call-out £89 to £199 · drain £199 to £1,999 |
| Time on site | About 55 minutes |
| Helpline | 01293 248666 |
It is worth separating SCR from the DPF before acting on any advice. Both sit in the exhaust, both light a warning lamp, and the standard advice for one — a long run at motorway speed — does nothing at all for the other.
The call-out is £89 to £199. An AdBlue tank drain and flush is quoted on the phone before a technician travels. If the SCR system needs component replacement — dosing injector, pump, tank or catalyst — that is separate, and you will be told before any work starts. If this is a job we cannot fix at the roadside, we will tell you that on the phone rather than after we arrive.
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What customers say
4.8 out of 5 from 2,190 Trustpilot reviews. What reviewers mention most is that the technician stayed calm and professional with a driver who was embarrassed and stressed, and that somebody arrived when they said they would.
The most common criticism is price. People do not expect a wrong-fluid job to cost what it costs, and that is a fair complaint to publish rather than bury. The answer is the Call-out from £89, a quote given on the phone before a technician travels, and being told when a job cannot be done at the roadside rather than after somebody has arrived and charged for the visit.
Who you are dealing with
This site is published by Forecourt Assistance, which operates AdBlue in Fuel. Forecourt Assistance is a trading name of Fuel Fixer Ltd, company no 08520551, registered at Fairway House, Portland Road, East Grinstead, RH19 4ET, a company of Fuel Fixer International. The group, Fuel Fixer International, is owned by Stockbridge Capital Holdings.
Reference: GOV.UK — vehicle approval.
Across the Fuel Fixer network
AdBlue in Fuel is a service by Forecourt Assistance, a brand of Fuel Fixer International, owned by Stockbridge Capital Holdings. The full group directory is at forecourtassist.co.uk/network.