Luxury Platform Telemetry

Mercedes-Benz OBD-II Diagnostics & Fault Codes

Factory diagnostic trouble code directory for Mercedes-Benz vehicles (C-Class, E-Class, S-Class, GLC, GLE). Access model-specific sensor tolerances, live freeze-frame telemetry, and verified DIY repair procedures.

Reliability Index

High (German Engineering Standard)

Industry Standard

Dealership Labor Rate

$185/hr

National Average

Avg. Sensor Cost

$190 - $340

OEM Direct Replacement

Protocol Standards

ISO 15765-4 CAN

SAE J1979 Compliant

Model Selection

Select Your Mercedes-Benz Model (7 Supported)

Luxury

2020–2026Sedan

Mercedes-Benz C-Class

2.0L Turbo 4-Cyl with 48V Mild Hybrid (M254 255HP) / AMG C 43 (402HP)

DLC Port GuideDTC Codes

Luxury

2020–2026Sedan

Mercedes-Benz E-Class

2.0L Turbo 4-Cyl (E 350) / 3.0L Turbo Inline-6 (M256 E 450 375HP)

DLC Port GuideDTC Codes

Ultra-Luxury

2021–2026Sedan

Mercedes-Benz S-Class

3.0L Turbo I6 (S 500) / 4.0L Bi-Turbo V8 (M176 S 580 496HP)

DLC Port GuideDTC Codes

Luxury

2020–2026SUV

Mercedes-Benz GLC

2.0L Turbo 4-Cyl with EQ Boost (255HP) / AMG GLC 43 4MATIC

DLC Port GuideDTC Codes

Luxury

2020–2026SUV

Mercedes-Benz GLE

2.0L Turbo / 3.0L Turbo I6 (GLE 450 375HP) / 4.0L V8 GLE 580

DLC Port GuideDTC Codes

Ultra-Luxury

2020–2026SUV

Mercedes-Benz GLS

3.0L Turbo I6 (GLS 450) / 4.0L Bi-Turbo V8 (GLS 580 / Maybach)

DLC Port GuideDTC Codes

Ultra-Luxury

2020–2026SUV

Mercedes-Benz G-Class

4.0L Bi-Turbo V8 (M177 AMG G 63 577HP) / 3.0L I6 Mild Hybrid G 550

DLC Port GuideDTC Codes

Brand Telemetry

Most Common Mercedes-Benz Check Engine Trouble Codes

P0420Mercedes-Benz Specific

Est. DIY Parts: $400 - $1,800 (DIY: $150 - $400)

P0420 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0420: P0420: Catalyst System Efficiency Below Threshold (Bank 1) specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

P0300Mercedes-Benz Specific

Est. DIY Parts: $100 - $600 (DIY: $30 - $120)

P0300 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0300: P0300: Random or Multiple Cylinder Misfire Detected specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

P0171Mercedes-Benz Specific

Est. DIY Parts: $80 - $350 (DIY: $15 - $70)

P0171 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0171: P0171: System Too Lean (Bank 1) specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

P0128Mercedes-Benz Specific

Est. DIY Parts: $120 - $300 (DIY: $25 - $60)

P0128 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0128: P0128: Coolant Temperature Below Thermostat Regulating Temperature specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

P0442Mercedes-Benz Specific

Est. DIY Parts: $25 - $200 (DIY: $15)

P0442 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0442: EVAP System Small Leak Detected - Diagnosis & Repair Guide specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

P0500Mercedes-Benz Specific

Est. DIY Parts: $140 - $340 (DIY: $30 - $75)

P0500 on Mercedes-Benz: Symptoms & Fix

Factory troubleshooting procedure for P0500: P0500: Vehicle Speed Sensor (VSS) Malfunction specifically affecting Mercedes-Benz (C-Class, E-Class).

5-Step OEM FixDiagnose Mercedes-Benz

Full Diagnostic Library

All OBD-II Codes for Mercedes-Benz

Showing 1–18 of 122 codes

Active:

1. Filter by Vehicle Manufacturer (25 Makes)

2. DTC System Category

3. Risk Severity Level

P0300Critical Severity

Est. DIY: $100 - $600 (DIY: $30 - $120)

P0300: Random or Multiple Cylinder Misfire Detected

Flashing Check Engine Light (CEL) • Engine shaking, vibrating, or jerking at idle

5 Step DIY GuideTroubleshoot

P0420Medium Severity

Est. DIY: $400 - $1,800 (DIY: $150 - $400)

P0420: Catalyst System Efficiency Below Threshold (Bank 1)

Illuminated Check Engine Light (steady) • Rotten egg / sulfur odor from exhaust

5 Step DIY GuideTroubleshoot

P0171Medium Severity

Est. DIY: $80 - $350 (DIY: $15 - $70)

P0171: System Too Lean (Bank 1)

Check Engine Light on • Rough idling or engine hesitation on acceleration

5 Step DIY GuideTroubleshoot

P0128Low Severity

Est. DIY: $120 - $300 (DIY: $25 - $60)

P0128: Coolant Temperature Below Thermostat Regulating Temperature

Check Engine Light • Cabin heater takes too long to warm up

5 Step DIY GuideTroubleshoot

P0455Low Severity

Est. DIY: $15 - $250 (DIY: $15 - $50)

P0455: Evaporative Emission Control System Leak Detected (Gross Leak)

Check Engine Light on • Gas cap loose warning message on dashboard

5 Step DIY GuideTroubleshoot

P0101Medium Severity

Est. DIY: $45 - $220 (DIY Clean: $12)

Mass Air Flow (MAF) Sensor Circuit Range/Performance

Check Engine Light (CEL) illuminated • Rough or erratic engine idle

4 Step DIY GuideTroubleshoot

P0135Low to Medium Severity

Est. DIY: $80 - $240 (DIY Sensor: $45)

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

Check Engine Light on • Slightly increased fuel consumption on short trips

3 Step DIY GuideTroubleshoot

P0172Medium Severity

Est. DIY: $30 - $280 (DIY Clean: $15)

System Too Rich (Bank 1) - Symptoms, Causes & Step-by-Step Fix

Check Engine Light on • Strong unburnt fuel odor from exhaust

3 Step DIY GuideTroubleshoot

P0442Low Severity

Est. DIY: $25 - $200 (DIY: $15)

EVAP System Small Leak Detected - Diagnosis & Repair Guide

Check Engine Light on • Intermittent faint fuel odor near rear wheel well

3 Step DIY GuideTroubleshoot

P0507Medium Severity

Est. DIY: $40 - $250 (DIY Throttle Relearn: $0)

Idle Control System RPM Higher Than Expected - Diagnosis

Engine idles at 1,000+ RPM in park/neutral • RPM surges or hunts at red lights

3 Step DIY GuideTroubleshoot

P0010Moderate Severity

Est. DIY: $120 - $350 (DIY: $40 - $80)

P0010: Camshaft Position Actuator Circuit / Open (Bank 1)

System alert or indicator light illuminated (P0010) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0011High Severity

Est. DIY: $150 - $450 (DIY: $50 - $120)

P0011: Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

System alert or indicator light illuminated (P0011) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0012High Severity

Est. DIY: $150 - $450 (DIY: $50 - $120)

P0012: Camshaft Position - Timing Over-Retarded (Bank 1)

System alert or indicator light illuminated (P0012) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0013Moderate Severity

Est. DIY: $120 - $320 (DIY: $40 - $75)

P0013: Exhaust Camshaft Position Actuator Circuit / Open (Bank 1)

System alert or indicator light illuminated (P0013) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0014High Severity

Est. DIY: $150 - $420 (DIY: $45 - $90)

P0014: Exhaust Camshaft Position Timing Over-Advanced (Bank 1)

System alert or indicator light illuminated (P0014) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0016Critical Severity

Est. DIY: $300 - $1,200 (DIY: $80 - $250)

P0016: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

System alert or indicator light illuminated (P0016) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0017Critical Severity

Est. DIY: $300 - $1,200 (DIY: $80 - $250)

P0017: Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)

System alert or indicator light illuminated (P0017) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

P0100Moderate Severity

Est. DIY: $100 - $300 (DIY: $15 - $80)

P0100: Mass or Volume Air Flow Circuit Malfunction

System alert or indicator light illuminated (P0100) • Intermittent performance throttling or unexpected operation halts

5 Step DIY GuideTroubleshoot

Technical FAQ

Frequently Asked Questions

What are the most common Check Engine fault codes on Mercedes-Benz vehicles?

On Mercedes-Benz vehicles, the most frequently logged diagnostic trouble codes are P0420 (Catalytic Converter Efficiency), P0300 (Random Misfire), P0171 (System Lean), and P0128 (Coolant Thermostat).

How much does a dealer diagnostic scan cost for a Mercedes-Benz?

Standard diagnostic fees at authorized Mercedes-Benz dealerships range from $120 to $180, aligned with their $185/hr standard hourly labor rate. Independent auto parts stores can read codes for free.

Can I clear a Mercedes-Benz Check Engine light with an OBD-II scanner?

Yes, any standard OBD-II / EOBD scanner connected to the 16-pin DLC port can clear logged DTC codes and turn off the Check Engine light once the underlying mechanical defect has been resolved.