Excessive Renault/Peugot AL-4 and DPO plunger valve and bore wear results in high line pressure conditions. Excessive wear of the pressure regulator valve and bore in these units may cause low, high or unstable line pressure issues. Reconditioning the bore and installing Sonnax oversized pressure regulator valve kit 120940-01K restores correct pressure regulator and plunger valve operation to provide appropriate line pressure for all operating conditions.
Contact a Sonnax Parts Distributor.
Vacuum tests at the ports indicated (A, B, C & D) do not hold 18" or if a Wet Air Test at the same locations result in leaking at the corresponding ports.