P0191 to P0193: fuel rail pressure sensor circuit and performance
Before you conclude the fuel system cannot hold pressure, confirm that the thing measuring pressure is telling the truth. These codes are about the instrument.
0 0 0
Blog
P0217: engine over-temperature condition — the code after the damage starts
Most codes warn you. This one records that the engine already exceeded its safe temperature, which makes it a damage-assessment code as much as a diagnostic one.
0 0 0
P0230 to P0232: fuel pump primary circuit faults
These codes are about the circuit that switches the pump, not the pump itself. The distinction is worth several hundred in parts.
0 0 0
P0251: injection pump fuel metering control on a diesel
The metering valve decides how much fuel the high pressure pump takes in. When it stops obeying, the whole rail pressure loop loses its main lever.
0 0 0
P0263 to P0266: cylinder contribution and balance faults
These codes name a cylinder that is not pulling its weight. Unlike a misfire code, they can appear while the engine still feels smooth.
0 0 0
P0301-P0304: misfire on a specific cylinder and how to localise it
A cylinder-specific misfire code hands you the location for free. The swap test then tells you whether the fault travels with the part or stays with the cylinder.
0 0 0
P0305 to P0308: misfire on cylinders 5 to 8 and V-engine numbering
The diagnosis is the same as any misfire. What is different is finding the cylinder, because on a V-engine the numbering is rarely what you would guess.
0 0 0
P0313 and P0314: misfire detected with low fuel level
This is a code with a built-in explanation. The engine misfired, and the ECU noted that the tank was nearly empty — so it declined to blame the ignition system.
0 0 0
P0316: misfire detected on startup — the cold-start-only fault
P0316 only counts misfires in the first seconds after cranking. That narrow window points at a specific short list of causes that a warm-engine test will never reproduce.
0 0 0
P0320 to P0322: ignition and engine speed input circuit
Without a reliable RPM signal the ECU cannot time a single injection or spark. These codes describe losing that signal, and the symptom is usually a car that stops.
0 0 0
P0327 and P0332: knock sensor circuit low on bank 1 and 2
The knock sensor is the engine hearing itself detonate. When it goes quiet, the ECU protects the engine by removing timing — and you lose power for a reason you cannot see.
0 0 0
P0336: crankshaft position sensor range/performance and the reluctor ring
P0335 means no signal. P0336 means a signal that is present but wrong, and that difference frequently points at the toothed wheel rather than the sensor.
0 0 0