system to lean?

Question

oxygen sensors are reading lean also system to lean what does that mean? also i have multiple cylinder misfires would that be caused from the oxygen sensors?

Answer 1

Hi there,

If the O2's are reading lean, then typically it indicates either low fuel pressure, an intake manifold leak or a bad mass air flow sensor. These issues cause a lean condition and multiple misfires. I would check the mass air flow first, followed by looking for intake air leaks, and then the fuel pressure.