Opel Corsa and Insignia: common OBD faults
Two Opels from different eras and different parents. Which platform yours sits on — GM or PSA — determines the entire fault list, so establish that first.
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P0010 and P0013: camshaft actuator circuit — the solenoid, not the phaser
These two codes name a circuit, and the circuit is usually fine. What actually fails is the oil control solenoid, and what causes that is the oil.
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P0017 to P0019: crank-cam correlation on bank 2 and what it costs to ignore
These codes say the camshaft is not where the crankshaft expects it. On an interference engine that gap has a hard limit, and the warning window is short.
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P0030 to P0037: oxygen sensor heater circuit faults explained
A heater code is not a mixture code. It means the sensor cannot get to working temperature fast enough, and the consequences show up during warm-up.
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P0053 and P0054: heater resistance out of range — an ageing sensor, measured
These codes are unusual: the circuit works, but the number is wrong. That makes them one of the few codes that predict a failure instead of reporting one.
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P0071 to P0073: ambient air temperature sensor and the systems that trust it
A cheap sensor in the front bumper feeds the climate control, the ice warning and sometimes the engine. When it lies, several unrelated things misbehave at once.
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P0087: fuel rail pressure too low — pump, filter or regulator?
P0087 means actual rail pressure fell short of the commanded value. Comparing desired against actual pressure under load tells you whether to blame the filter, the pump or a leaking regulator.
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P0088: fuel rail pressure too high and what it does to injectors
P0088 is rarer than its low-pressure twin and more urgent. Excess rail pressure stresses injectors and pipework, and the cause is nearly always a control valve that stopped controlling.
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P0090 and P0091: fuel pressure regulator control circuit
On a common rail diesel the ECU controls rail pressure with a solenoid. These codes mean it cannot, and the difference between a circuit fault and a hydraulic one matters.
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P0093: fuel system large leak detected — stop driving and find it
This is one of the few codes that justifies stopping where you are. Diesel at rail pressure onto a hot turbo is a fire, not an inconvenience.
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P0101: MAF sensor range/performance — why airflow does not match expectation
P0101 is not a dead sensor code. It means measured airflow disagrees with what the ECU calculated. Here is how to tell a dirty MAF from a vacuum leak, a clogged filter and a tired engine.
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P0102 and P0103: MAF circuit low and high input
These two codes mean the MAF signal left its electrical window entirely. Unlike P0101 they point at wiring, connectors and power supply far more often than at the sensor itself.
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