دائرة مرجع الحساس مقصورة

A sensor's regulated reference supply shorted — to earth, to another circuit, or by a failed sensor pulling it down. The reference is shared, which is the whole point of this entry: one short takes out every sensor fed by that supply.

So the codes arrive in a cluster naming unrelated sensors, and the temptation is to suspect the module that reports them all. Several sensors on one reference failing together locates the fault on the shared wire rather than in any sensor, and that inference is the fastest route through it.

The module usually protects itself by shutting the reference down, so every sensor on it reads zero or out of range at once. Disconnect sensors one at a time with the reference monitored — the voltage recovering as one is unplugged names the culprit. If it recovers with all of them disconnected, the short is in the harness, typically where a reference wire runs alongside an earth or a switched supply and both have chafed.