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Diagnostics & troubleshooting

P0128 – Coolant temperature below thermostat regulating temperature | OBDeleven

A P0128 diagnostic code indicates the coolant temperature is below normal. Learn possible causes, symptoms, and troubleshooting tips for P0128.

P0128 – Coolant temperature below thermostat regulating temperature

Coding & customizations

New One-Click Apps added in June 2024

Explore our latest collection of One-Click Apps added in June 2024. Customize your car's features for a personalized driving experience.

P0300 – Multiple cylinder misfire detected | OBDeleven

A P0300 diagnostic code indicates a random cylinder misfire. Learn possible causes, symptoms, and troubleshooting tips for P0300.

P0300 – Random/Multiple cylinder misfire detected

P0456 – EVAP system very small leak | OBDeleven

A P0456 diagnostic code indicates a small leak in the EVAP system. Learn possible causes, symptoms, and troubleshooting tips for P0456.

P0456 – Evaporative emission control system very small leak detected

P0171 – Fuel trim. System too lean (bank 1) | OBDeleven

A P0171 diagnostic code indicates that the fuel trim system is too lean. Learn possible causes, symptoms, and troubleshooting tips for P0171.

P0171 – Fuel trim. System too lean (bank 1)

P0420 – catalyst system efficiency below threshold (bank 1) | OBDeleven

A P0420 diagnostic code indicates catalyst system efficiency issues. Learn possible causes, symptoms, and troubleshooting tips for P0420.

P0420 – Catalyst system efficiency below threshold (bank 1)

OBD Diagnostic Trouble Codes (DTC) | OBDeleven

Learn how to read and interpret OBD diagnostic trouble codes. Our comprehensive library covers standard OBD2 and manufacturer-specific codes.

OBD Diagnostic Trouble Codes (DTC)

Maintenance

How to change & register a car battery  | OBDeleven

Read our step-by-step guide on how to change and register a car battery using OBDeleven.

How to change & register a car battery

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