What is an OBD2 code?

An OBD2 (On-Board Diagnostics II) code, also called a Diagnostic Trouble Code (DTC), is a standardized alphanumeric code generated by your vehicle's computer when it detects a malfunction. Codes start with P (Powertrain), B (Body), C (Chassis), or U (Network) followed by four digits.

Can I drive with the check engine light on?

A steady check engine light usually means you can drive short distances to get it diagnosed. A flashing check engine light means stop driving immediately — it indicates an active misfire that can destroy the catalytic converter within minutes.

How much does it cost to fix a check engine light?

Repair costs vary by code. A loose gas cap (P0442) costs $0–$20. An oxygen sensor (P0131) runs $100–$300. A catalytic converter (P0420) can cost $500–$2,000+. Each code page on AUTO CODE FIX shows a specific estimated cost range.

What is AUTO CODE FIX?

AUTO CODE FIX is a free online tool providing instant lookup for 2,600+ OBD2 diagnostic trouble codes. Each code includes plain-language explanations, common causes, symptoms, step-by-step repair guidance, severity ratings, and cost estimates. It also features an AI assistant and supports 12 languages.

AUTO CODE FIX — OBD2 Trouble Code Lookup & Repair Guide

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