These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Alternative Fuel Tank A Level Sensor Circuit High

Alternative Fuel Tank A Level Sensor Circuit Intermittent/Erratic

Alternative Fuel Rail Temperature Sensor Circuit

Alternative Fuel Rail Temperature Sensor Performance

Alternative Fuel Rail Temperature Sensor Circuit Low

Alternative Fuel Rail Temperature Sensor Circuit High

Alternative Fuel Rail Temperature Sensor Circuit Intermittent/Erratic

Engine Oil Temperature Sensor B Circuit

oil-temperature plausibility uses repeated cross-checks

oil-temperature sensor B falls below its resistance limit

sensor B oil-temperature resistance is electrically high

oil-temperature sensor B fails the cumulative-change check

Fuel Rail Pressure Sensor Circuit Bank 2

bank-2 rail-pressure plausibility includes a stuck check

Fuel Rail Pressure Sensor Circuit Low Bank 2

Fuel Rail Pressure Sensor Circuit High Bank 2

Fuel Rail Pressure Sensor Circuit Intermittent/Erratic Bank 2

Fuel Pressure Sensor A Circuit

Fuel Pressure Sensor A Circuit Range/Performance

Low pressure-sensor signal from the number 4 diesel injector assembly

High pressure-sensor signal in the number 4 injector

Fuel Pressure Sensor A Circuit Intermittent/Erratic

Fuel Rail/System Pressure - Too Low Bank 2

Fuel Rail/System Pressure - Too High Bank 2

bank-2 rail pressure during the starting sequence

cylinder 1 shows positive drift in the small-injection test

cylinder 1 has negative SQP injection drift

cylinder 2 exceeds its positive injection-correction limits

the SQP test finds cylinder 2 drift in the advanced direction

cylinder 3 requires excessive positive SQP correction

cylinder 3 produces an excessive negative injection correction

cylinder 4 fails positive drift limits in SQP learning

the cylinder 4 SQP result drifts in the advanced direction

cylinder 5 exceeds the positive small-injection drift limit

cylinder 5 shows negative drift in the SQP test

cylinder 6 shows excessive positive small-injection drift

the cylinder 6 SQP calculation shows negative drift

Cylinder 7 timing performance can be learned from rail-pressure changes

Advanced cylinder 7 injection needs quantity and timing evidence

Cylinder 8 retarded-injection evidence depends on a completed learning cycle

Check the signed learning result before diagnosing advanced cylinder 8 injection

Cylinder 9 Injection Timing Performance - Over Retarded

Cylinder 9 Injection Timing Performance - Over Advanced

Cylinder 10 Injection Timing Performance - Over Retarded

Cylinder 10 Injection Timing Performance - Over Advanced

Cylinder 11 Injection Timing Performance - Over Retarded

Cylinder 11 Injection Timing Performance - Over Advanced

Cylinder 12 Injection Timing Performance - Over Retarded

Cylinder 12 Injection Timing Performance - Over Advanced

Audi's temperature-control sensor circuit uses a high-voltage criterion

start-up temperature comparisons reveal a plausibility problem

coolant sensor 3 low electrical input

Coolant sensor 3 high is a voltage-boundary diagnosis

coolant sensor 3 intermittent-connection monitoring

Engine Coolant Heater A Control Circuit/Open

Engine Coolant Heater A Control Circuit Low

Engine Coolant Heater A Control Circuit High

Engine Coolant Heater A Control Circuit Performance

Engine Coolant Heater B Control Circuit/Open

Engine Coolant Heater B Control Circuit Low

Engine Coolant Heater B Control Circuit High

Engine Coolant Heater B Control Circuit Performance

Coolant falls below the monitor temperature after warming up

O2 Sensor Circuit Bank 1 Sensor 4

O2 Sensor Circuit Low Voltage Bank 1 Sensor 4

O2 Sensor Circuit High Voltage Bank 1 Sensor 4

O2 Sensor Circuit Slow Response Bank 1 Sensor 4

O2 Sensor Circuit No Activity Detected Bank 1 Sensor 4

O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 4

O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 4

Engine Coolant Heater A Control Circuit Driver Current/Temperature Too High

Engine Coolant Heater B Control Circuit Driver Current/Temperature Too High

Turbocharger Outlet Pressure Sensor B Circuit

Turbocharger Outlet Pressure Sensor B Range/Performance

Turbocharger Outlet Pressure Sensor B Circuit Low

Turbocharger Outlet Pressure Sensor B Circuit High

Turbocharger Outlet Pressure Sensor B Intermittent/Erratic

Turbocharger Outlet Pressure Sensor A/B Correlation

Touareg V10 pump-injector circuit diagnosis

Cylinder 1 injector open-circuit feedback from the driver