Faulty lambda sensor: symptoms, fuel consumption and fault codes
Faulty lambda sensor: symptoms (high consumption, rough idle, P0130-P0141), the difference between the front and rear sensor. MasterTuning diagnosis.
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Diagnostic guides and OBD fault codes explained: symptoms, causes and what to do, from the MasterTuning workshop.
116 articles
Clogged catalytic converter: symptoms and how to check it
Clogged catalytic converter: loss of power, rotten-egg smell, P0420/P0430. Causes, how back-pressure is measured and why not to replace it unchecked.
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Dirty EGR valve: symptoms, cleaning and when to replace it
Dirty or stuck EGR valve: rough idle, black smoke, loss of power, DPF clogging. How it is checked, clean or replace, and indicative costs.
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Hard cold starting: causes on diesel and petrol
The car struggles to start when cold: causes (glow plugs, battery, fuel pressure, injectors) and how to find them. MasterTuning diagnosis.
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Turbo whistle: when it is normal and when it is a fault
Turbo whistle: a light hiss is normal, a loud whistle or one with loss of power is not. Causes, how to tell and what to do before it breaks.
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Vibration at idle: shaking engine, causes and fixes
Engine shaking at idle: most common causes (spark plugs, injectors, engine mounts, EGR, DPF), how to tell them apart and what it costs to fix.
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Jerking under acceleration: why the car hesitates
Jerking, hesitation and flat spots under acceleration: causes on diesel and petrol (injection, ignition, turbo, EGR) and MasterTuning diagnosis.
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The car cuts out while driving: causes and what to do
The engine cuts out while you are driving: electrical and fuel supply causes, what to do safely and how the fault is found. MasterTuning.
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Car won't start but the starter turns: causes and solutions
Car will not start even though the starter turns: the most common causes (fuel, spark, crankshaft sensor, immobiliser, timing) and a step-by-step check.
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Sudden increase in fuel consumption: why and what to check
The car uses more fuel: mechanical and electronic causes of increased consumption (lambda sensor, injectors, DPF, tyres) and MasterTuning checks.
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Limp mode: what it is and how to get out of it
Car in limp mode: what it means, which faults trigger it and how it is really fixed. Professional diagnosis by MasterTuning.
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Sudden loss of power: the most common causes
The car has no pull any more: causes of sudden loss of power on diesel and petrol (turbo, DPF, injection, sensors) and MasterTuning diagnosis.
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