"Check Anti-Pollution System" or general warning lights on the dashboard.
A boost leak after the turbo (intercooler hoses, intake manifold gasket, or charge air cooler) allows pressurized air to escape. The MAP sensor reads low pressure, but the turbo works harder to compensate. The ECU sees this mismatch and logs P158B. p158b renault
Frustrated, he leaned back against the workbench. He looked at the car. It sat there, inert, the rain sliding down its windshield. "Check Anti-Pollution System" or general warning lights on
More specifically, it indicates that the Engine Control Unit (ECU) has detected an inconsistency between the and the actual boost pressure measured by the MAP (Manifold Absolute Pressure) sensor and the BARO (Barometric Pressure) sensor. The deviation exceeds the allowable threshold, triggering the fault. The ECU sees this mismatch and logs P158B
The ECU detects a signal mismatch and restricts engine power to protect the vehicle. The Challenge of Vintage Maintenance