If you receive customer reports in the above model of the engine vibrating, rpm fluctuations at idle or poor accelerator response with codes P2020 (P0172), P2046, P201C or P201A in the engine control unit, please perform the below procedure. The partial load breathing towards intake manifold hose, cylinder crankcase breathing hose or the non-return valve to nozzle hose may be torn at the connection to the crankcase. Air will bypass the air mass sensor, i.e. unmeasured air will enter the intake, causing the engine to run lean.
Remedy:

1. Remove compressor (supercharger). Refer to WIS document AR09.50-P-4705QK.
2. Remove and inspect the partial load breathing towards intake manifold hose, cylinder crankcase breathing hose and the non-return valve to nozzle hose for crankcase ventilation. If damaged, replace as needed. Refer to Figure 1 for details.
3. Install compressor (supercharger). Refer to WIS document AR09.50-P-4705QK.

Note:

• Use “click clamp” as specified in parts information for securing hose.
• Ensure that clamp is positioned as close to the end of the hose and fastened tightly.