Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0418Secondary Air Injection System Relay "A" Circuit •
Manufacturer communications
9Original wording in English
LEXUS
TSB: REVISION NOTICE February 16, 2016 Rev2: ? The Parts Information and Repair Procedure sections have been updated. Some 2010 ? 2013 model year GX 460 vehicles equipped with 1UR-FE engines may exhibit a MIL ?ON? condition with Diagnostic Trouble Code (DTC) P0418, P2440, P2442, and/or P2445 present. The Secondary Air Injection …
LEXUS
TSB: Some 2010 ? 2013 model year GX 460 vehicles equipped with 1UR-FE engines may exhibit a MIL ?ON? condition with Diagnostic Trouble Code (DTC) P0418, P2440, P2442, and/or P2445 present. The Secondary Air Injection Pump filter and Air Switching Valve Assembly have been modified to reduce the possibility of this condition occur…
LEXUS
TSB: Some 2010 ? 2013 model year GX 460 vehicles equipped with 1UR-FE engines may exhibit a MIL ?ON? condition with Diagnostic Trouble Code (DTC) P0418, P2440, P2442, and/or P2445 present. The Secondary Air Injection Pump filter and Air Switching Valve Assembly have been modified to reduce the possibility of this condition occur…
TOYOTA
Some 2005 ? 2009 model year 4Runner, 2006 ? 2007 model year Land Cruiser, 2005 ? 2007 model year Sequoia, and 2005 ? 2006 model year Tundra vehicles equipped with the 2UZ-FE (4.7 L) engine may exhibit a MIL ?ON? condition for the following Diagnostic Trouble Codes (DTCs): ? P0412 ? Secondary Air Injection System Switching Valve …
Check vehicle applicability
23A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Secondary Air Injection System Relay A circuit Malfunction
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.