Real diagnostic cases

CASE 001 intermediate

Battery Discharges Overnight

The engine cranks slowly in the morning. The customer reports the battery has been replaced twice and the problem returns within a...

Petrol

CASE 002 intermediate

Engine Cranks But Will Not Start

The engine turns over at normal speed but does not fire. The customer ran out of fuel last week.

Petrol P0335 Crankshaft position sensor A circuitP0087 Fuel rail pressure too low

CASE 003 advanced

P0301 Cylinder 1 Misfire

Rough idle, slight shake and a loss of power. The check engine light is solid, not flashing.

Petrol P0301 Cylinder 1 misfire detectedP0300 Random misfire detected

CASE 004 intermediate

P0171 System Too Lean (Bank 1)

Rough idle, occasional hesitation and a check engine light. Fuel consumption has increased slightly.

Petrol P0171 System too lean, bank 1

CASE 005 advanced

P0299 Turbo Underboost

Loss of power, especially on hills. The turbo seems quiet and acceleration is flat.

Diesel P0299 Turbocharger/supercharger underboost

CASE 006 intermediate

Battery Warning Light and Weak Charging

The battery warning light glows faintly and the lights dim at idle. It improves when revved.

Diesel

CASE 007 advanced

Multiple Modules Offline (CAN Failure)

The instrument cluster shows several warnings. The engine runs but the ABS, stability and airbag lights are all on. The scanner ca...

Diesel U0100 Lost communication with ECM/PCMU0121 Lost communication with ABSU0151 Lost communication with airbag

CASE 008 intermediate

Engine Overheating in Traffic

Temperature rises in slow traffic and returns to normal on the open road. The coolant level drops slowly.

Diesel

CASE 009 advanced

ABS Warning and Intermittent Pulses

The ABS light comes on intermittently at low speed and the pedal pulses occasionally when braking gently.

Petrol C0035 Left front wheel speed sensor circuitC0040 Right front wheel speed sensor circuit (intermittent)

CASE 010 advanced

Diesel Hard Starting When Cold

The engine is difficult to start when cold, with grey-white smoke and rough running for a few seconds.

Diesel P0380 Glow plug/heater circuit A

CASE 011 advanced

Random Misfire P0300 After City Driving

The engine stumbles at idle after a long period of short city journeys. The check engine light comes on intermittently.

Petrol P0300 Random/multiple cylinder misfireP0401 EGR flow insufficient

CASE 012 advanced

P0172 System Too Rich

Black smoke under acceleration, poor economy and a strong fuel smell from the exhaust.

Petrol P0172 System too rich, bank 1P0087 Fuel rail pressure too low (intermittent)

CASE 013 expert

DPF Warning and Severe Power Loss

The DPF warning light is on and the vehicle is in limp mode with very little power.

Diesel P2002 Particulate filter efficiency below thresholdP2463 Particulate filter soot accumulation

CASE 014 expert

Engine Cranks But No Start — Immobilizer

The engine cranks normally but will not fire, and a key/security warning is shown on the cluster.

Diesel B1000 Immobilizer / anti-theft codeP0513 Invalid key code

CASE 015 expert

Hybrid Auxiliary Battery Keeps Going Flat

The hybrid will not start after standing for a few days. The auxiliary (12 V) battery is repeatedly flat though the traction batte...

Hybrid B1318 Battery voltage lowU0110 Lost communication with drive motor control module (intermittent)

CASE 016 intermediate

AC Cold on the Motorway, Warm in Traffic

The air conditioning blows cold when driving but warm when the car is stationary in traffic. The compressor clutch engages normall...

Petrol