Mercedes-Benz Error Code P1335: How to Fix It

Medium 1-3 hours High Severity Verified June 2026
Error Code
P1335
Brand
Mercedes-Benz
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
Mercedes-Benz error code P1335 indicates that the engine charge sensor B1 is sending an implausible or unreliable signal to the engine control unit. This sensor monitors engine boost pressure and is critical for proper turbocharger operation and fuel mixture control.
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Tools You'll Need

How to Fix Error Code P1335

  1. Connect OBD2 Scanner and Verify Code

    Ensure the vehicle is parked on level ground with the parking brake engaged.
  2. Clear Codes and Test Drive

    Do not drive aggressively or exceed speed limits during testing. If the engine goes into limp mode, return to a safe location immediately.
  3. Locate and Inspect Charge Pressure Sensor

    Allow the engine to cool completely before inspection. Hot engine components can cause burns.
  4. Test Vacuum Lines and Connections

  5. Check Electrical Connections

    Disconnect the battery negative terminal before working with electrical connections.
  6. Test Sensor Voltage and Resistance

    Ensure multimeter is set to correct ranges before testing to avoid damage.
  7. Replace Charge Pressure Sensor if Faulty

    Use only the correct thread sealant type specified by Mercedes to prevent sensor damage.
  8. Clear Codes and Verify Repair

Parts You May Need

Charge pressure sensor
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Electrical connector
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Charge pressure sensor
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Electrical connector
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Charge pressure sensor
Check Price on Amazon
Electrical connector
Check Price on Amazon
Charge pressure sensor
Check Price on Amazon
Electrical connector
Check Price on Amazon
Charge pressure sensor
Check Price on Amazon
Electrical connector
Check Price on Amazon
Charge pressure sensor
Check Price on Amazon
Electrical connector
Check Price on Amazon
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When to Call a Professional

Call a Mercedes specialist if you're uncomfortable working with electrical systems, if the turbocharger system requires disassembly, if multiple related codes appear indicating broader engine management issues, or if the problem persists after sensor replacement as this may indicate ECU programming issues.

Frequently Asked Questions

Can I drive my Mercedes with error code P1335?
You should avoid driving with P1335 as it affects turbocharger operation and can cause engine damage. The vehicle may enter limp mode with reduced power. Have it diagnosed promptly to prevent further issues.
How much does it cost to fix Mercedes P1335 error?
If it's just the charge pressure sensor, costs range from $150-400 including parts and labor. However, if turbocharger or ECU issues are involved, repairs can cost $2000-5000 or more at a dealership.
What causes Mercedes charge pressure sensor to fail?
Common causes include sensor age, exposure to extreme temperatures, oil contamination from turbocharger leaks, electrical connector corrosion, damaged vacuum lines, or debris in the intake system.
Will P1335 cause my Mercedes to fail emissions testing?
Yes, P1335 will likely cause your vehicle to fail emissions testing as it affects engine management and boost control systems. The code must be resolved before passing inspection.
How can I prevent Mercedes P1335 error from happening again?
Regular maintenance including air filter changes, using quality fuel, addressing turbocharger issues promptly, and keeping the intake system clean can help prevent sensor failures. Replace sensors at recommended intervals.