Popular OBD codes
Common OBD Code Repair Costs
Each code page links symptoms and likely repairs into the repair cost directory.
P0420 Code
DiagnosticP0420 usually points to catalytic converter efficiency below threshold.
Repair cost range
$180-$2,900
P0300 Code
DiagnosticP0300 means the engine computer detected random or multiple-cylinder misfires.
Repair cost range
$120-$1,100
P0171 Code
DiagnosticP0171 means the engine is running too lean on bank 1.
Repair cost range
$100-$850
Repair categories
How OBD Codes Affect Repair Costs
Codes often point toward emissions, ignition, electrical, or engine systems.
Exhaust & Emissions Repair Costs
Estimate catalytic converter, exhaust leak, oxygen sensor, and PCV valve repairs.Electrical & Battery Repair Costs
Estimate alternator, battery, oxygen sensor, and hybrid battery replacement costs.Engine Repair Costs
Compare common engine repairs, including cooling, gasket, timing, mount, and leak work.Related repairs
OBD-Linked Repair Pages
FAQ
OBD code questions
No. Codes narrow the diagnostic path, but a mechanic still needs to confirm the failed part and related causes.
Many diagnostic visits fall between $80 and $180 before parts and labor are added.
It depends on the symptom. Misfires, overheating, and flashing lights need fast inspection.
Yes. The same light can point to low-cost sensors or higher-cost catalytic converter and engine issues.
Clearing codes without repair can hide useful diagnostic history and may not solve the issue.