← View Generic P0442 Guide Severity: Low
🚗 Vehicle-Specific Guide

This guide is customized for your 1991 Mercedes Benz 500SL

P0442: EVAP System Leak Detected Small Leak

on 1991 Mercedes Benz 500SL

Fix Cost
$20 - $200
Parts & Labor
Difficulty
2/5
30 mins - 2 hours
DIY Possible?
✅ Yes
Save money
Your Vehicle
1991 Mercedes Benz
500SL
⚠️

Important for 1991 Mercedes Benz 500SL Owners

Before starting repairs, verify which engine your 1991 Mercedes Benz 500SL has. Check your VIN or engine code to ensure you order the correct parts.

📖 What Does P0442 Mean on 1991 Mercedes Benz 500SL?

A small leak has been detected in the evaporative emission control system. This system prevents fuel vapors from escaping into the atmosphere.
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Symptoms

  • • Check engine light (usually the only symptom)
  • • occasional fuel odor
  • • failed emissions test.
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Common Causes

  • • Loose or damaged gas cap
  • • cracked EVAP hoses
  • • faulty purge valve
  • • damaged charcoal canister
  • • loose connections in EVAP system.
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How to Fix P0442 on 1991 Mercedes Benz 500SL

Tighten or replace gas cap, inspect and replace damaged EVAP hoses, test and replace purge valve, check charcoal canister, perform smoke test to locate leak.

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Need Maintenance Info for Your 500SL?

Get oil capacity, filter specs, and torque settings for your specific 1991 Mercedes Benz 500SL.

View 1991 Mercedes Benz 500SL Specs

Parts for 1991 Mercedes Benz 500SL

Gas Cap Shop ↗ EVAP Purge Valve Shop ↗ EVAP Canister Shop ↗ Vacuum Hoses Shop ↗

Essential Tool

Must Have

OBD2 Scanner

Read & clear codes on your 1991 Mercedes Benz 500SL

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Related Diagnostic Codes

Other codes that may appear with P0442

P0440 Same System

Evaporative Emission Control System Malfunction

Low
P0441 Same System

P0441: Evaporative Emission Control System Malfunction

Medium
P0443 Same System

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

Medium
P0446 Same System

Evaporative Emission Control System Vent Control Circuit Malfunction

Medium
P0455 Related Problem

EVAP System Leak Detected Large Leak

Medium

💡 Why These Codes Are Related:

  • • Similar Issues: Same root cause or component failure
  • • Related Problems: Often occur together due to system interactions
  • • Sequential Codes: Progressive failure stages or multiple sensors
  • • Same System: Components within the same automotive system