Opel Zafira and Meriva: family MPVs and their recurring faults
GM-era engines, family-car mileage patterns, and two specific items that appear in almost every used-buying discussion.
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P0530 to P0533: A/C refrigerant pressure sensor circuit
Air conditioning that refuses to engage on a hot day is usually not a broken compressor. It is a pressure reading the system does not trust.
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P0545 and P0546: exhaust gas temperature sensor circuit
These sensors protect the turbocharger and control DPF regeneration. When one fails, the ECU stops trusting the whole exhaust after-treatment system.
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P0560 to P0563: system voltage malfunction, unstable and high
Every module on the car runs on the same supply. When that supply misbehaves, you get a scattering of unrelated codes and one actual fault.
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P0571: brake switch A circuit and the cruise control that quit
A cheap switch behind the brake pedal disables cruise control, blocks the gear selector and confuses the stop lamps. All three complaints, one part.
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P0600 to P0605: control module memory and internal faults
The module is reporting a problem with itself. Before believing it, rule out the two things that make a healthy ECU report internal faults: voltage and connections.
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P0616 and P0617: starter relay circuit low and high
A click and no crank sends most people to the starter motor. These codes point at the circuit that commands it, which is usually cheaper and easier to reach.
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P0627 to P0629: fuel pump control circuit faults
Newer vehicles replaced the fuel pump relay with a control module that varies pump speed. That change moved the failure from a simple relay to a networked module.
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P0645 and P0646: A/C clutch relay control circuit
The compressor clutch is switched by a relay like any other high-current load. When the circuit faults, the air conditioning stops — and so does a lot of guesswork about refrigerant.
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P0650: MIL control circuit — when the warning lamp itself is the fault
The check engine light has its own diagnostic code, and it exists because a lamp that cannot illuminate makes every other fault invisible.
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P0685 to P0687: ECM power relay control circuit
The relay that keeps the engine computer alive after you switch off. When it misbehaves, the symptoms are a flat battery and codes that make no sense.
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P0691 and P0692: cooling fan 1 control circuit low and high
On a variable-speed fan there is no relay to swap. The control is a module and a signal, which changes both the symptoms and the diagnosis.
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