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P1101

P1101 - Air cleaner clogged alarm

Bosch · ECU Troubleshooting

What does P1101 mean?

This alarm indicates that the air cleaner element is clogged and restricting airflow. The system may reduce performance or shut down.

Common Causes

  • Dirty or blocked air filter
  • Faulty air cleaner sensor
  • Restriction in the air intake system

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and clean or replace the air filter.

  2. 2

    Inspect the air intake ducting for obstructions.

  3. 3

    If the alarm persists, have the air cleaner sensor checked.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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Source: Bosch ECU Troubleshooting
Open Manual (Page 7)Search more codes in this manual