P158b Renault -

Read the code and capture freeze frame data (engine RPM, load, boost pressure requested vs. actual, vehicle speed). This tells you if the fault occurs at idle, light throttle, or full load.

Note: On modern Renaults, do not force the electronic throttle valve open manually, as this can damage the gears inside. 3. Check for Vacuum Leaks p158b renault

If the check engine light is on but performance feels normal, you can drive moderately to a workshop. However, avoid full-throttle accelerations until the fault is diagnosed. Read the code and capture freeze frame data