Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car that helps clean the air coming out of the engine. It's like when a vacuum cleaner gets clogged and can't clean properly.
The AIR (Air Injection Reaction) System is responsible for reducing emissions by injecting fresh air into the exhaust stream. Code P25F6 indicates an issue with the secondary air injection system on the 'B' side of the engine.
The P25F6 code is triggered when the Engine Control Module (ECM) detects a malfunction in the secondary air injection system, specifically in the 'B' bank of the engine. This system is designed to reduce emissions by injecting air into the exhaust stream to help burn off excess hydrocarbons.
• Check Engine Light is on
• Failed emissions test
• Poor engine performance
• Faulty AIR pump
• Blocked AIR injection passages
• Damaged or leaking AIR hoses
AIR: Air Injection Reaction
ECM: Engine Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the AIR pump and hoses for damage or leaks.
• Check for blockages in the AIR injection passages.
• Replace the faulty AIR pump.
• Clear blockages in the AIR passages.
• Repair or replace damaged AIR hoses.
• OBD-II scanner
• Wrench set
• Vacuum gauge
$200 - $600
Moderate
• Chevrolet Silverado
• Ford F-150
• Toyota Camry
• Regular maintenance checks
• Replace air filters as needed
• Ensure proper engine tuning
Emission Control System Issue
• Address this issue promptly to avoid failing emissions tests.
• Consult a professional mechanic if unsure about repairs.
Check vehicle warranty for coverage on emissions-related repairs.
The AIR system has been used in vehicles since the 1970s to help reduce emissions.
Moderate – This issue should be addressed soon to ensure the vehicle passes emissions tests and maintains optimal performance.
Driving with a malfunctioning AIR system may lead to failing emissions tests and increased pollution.
• Engine at operating temperature
• Vehicle in park or neutral
The AIR pump and related components are typically located near the front of the engine bay.
Q: Can I drive with a P25F6 code?
A: Yes, but it's best to fix it soon to avoid emissions issues.
Q: Will this code affect my car's performance?
A: It might, especially in terms of emissions and fuel efficiency.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.