Калибровочный резистор в разъёме повреждён

A calibration resistor built into a component's connector, damaged so the module reads the wrong value. Some sensors and injectors are trimmed by a resistor in the plug rather than by a code entered with a tool — the module measures it and applies the correction automatically.

Damage gives a plausible but wrong correction, so the component is trimmed for a specification it does not have. Everything tests as working and the readings are merely wrong by a consistent amount, which is the hardest kind of fault to see.

The damage is nearly always mechanical and self-inflicted. A probe forced into the connector, a pin spread, or the resistor cracked when the plug was levered off. Measure the resistance across the identified pins and compare it against the specification — and note that this is a reason to be careful with test probes here, since the act of measuring badly is what breaks it.