P158b Renault [repack] -

: Low voltage can often trigger ghost codes like DF038 (internal electronic failure), which may accompany other drivetrain errors. New Sandero stalling on purpose! - UK Dacia Forum

The engine's computer relies on this continuous data stream to know exactly when to fire the spark plugs (in petrol engines) and when to inject fuel into each cylinder. p158b renault

It's also worth noting that code P158B is not exclusive to Renault. It can appear in other brands like BMW (where it relates to idle actuator governor monitoring), Mini, and even Volvo models that use Renault-sourced engines. : Low voltage can often trigger ghost codes

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. It's also worth noting that code P158B is

For variants where P158B targets the air intake loop, heavy carbon deposits around the butterfly valve of the electronic throttle body can cause mechanical binding. The actuator draws too much current trying to move, prompting the ECU to throw a circuit performance code. Common Symptoms to Watch For