Honda Diagnostic Trouble Codes
Common OBD2 fault codes found on Honda vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for Honda owners.
Ignition
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
Honda Civic • 2006-2024
The 1.5T (L15B7) in 2016+ Civics uses a VTC actuator that can fail, causing P0016 alongside a loud r...
Camshaft Position Sensor Circuit Malfunction
Honda Civic • 2006-2024
The Honda Civic CMP sensor on the R18A is a simple two-wire magnetic pickup. On the 1.5T, it is a th...
Fuel System
Mass Air Flow Sensor Range/Performance
Honda Civic • 2006-2024
Honda uses a Keihin MAF integrated into the airbox on many Civic models. The 1.5T (2016+) is more se...
System Too Lean (Bank 1)
Honda Civic • 2006–2024
The 1.5L turbo Civic (2016+) is susceptible to P0171 from the wastegate actuator linkage loosening o...
System Too Rich (Bank 1)
Honda Civic • 2006-2024
The 1.5L turbo in 2016+ Civics has a documented fuel dilution issue where gasoline mixes with engine...
System Too Lean (Bank 2)
Honda Civic • 2006-2024
Most Honda Civics are inline-4 and won't trigger P0174 (single bank). Only the rare V6 Civic (older ...
Idle Control System RPM Higher Than Expected
Honda Civic • 2006-2024
The R18A Civic uses an IACV (idle air control valve) that commonly sticks. Cleaning it with carb cle...
Cooling System
Emissions
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
Honda Civic • 2006-2024
Honda Civics with the R18A engine commonly trigger P0131 from O2 sensor aging around 130,000 km. The...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
Honda Civic • 2006-2024
The upstream sensor on the Civic R18A is accessible from the top of the engine. On the 1.5T, the sen...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
Honda Civic • 2006-2024
Honda Civics use NTK/NGK sensors as OEM. The downstream sensor on the R18A is straightforward to acc...
Exhaust Gas Recirculation (EGR) Flow Insufficient
Honda Civic • 2006-2024
Honda Civics with the R18A engine use a relatively simple EGR setup that rarely fails. The 1.5T (201...
Catalyst System Efficiency Below Threshold (Bank 1)
Honda Civic • 2006–2024
On 2006–2011 Civics with the R18A engine, P0420 is frequently caused by a failing rear oxygen sensor...
Catalyst System Efficiency Below Threshold (Bank 2)
Honda Civic • 2006-2024
Most Honda Civics are inline-4 and won't trigger P0430 (Bank 2 doesn't exist). If you see P0430 on a...
Misfire
EVAP System
Diagnose your Honda with Skanyx
Connect any Bluetooth OBD2 adapter to your Honda, scan for codes, and get AI-powered diagnostics with severity ratings and repair cost estimates.
Download Skanyx