P0418 Toyota Code - Secondary Air Injection System Relay 'A' Circuit Malfunction
Quick Answer
An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0418 Toyota indicates Secondary Air Injection System Relay 'A' Circuit Malfunction.
- Common causes
- Common causes include Faulty Air Pump inoperative, Air bypass solenoid harness is open or shorted, Air bypass solenoid circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0418 Toyota Description
What are the Possible Causes of the DTC P0418 Toyota?
- Faulty Air Pump inoperative
- Air bypass solenoid harness is open or shorted
- Air bypass solenoid circuit poor electrical connection
How to Fix the DTC P0418 Toyota?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
2005-2007 Toyota Sequoia
2005-2006 Toyota Tundra
Toyota Factory Service Bulletin OBDII Code P0418
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0418 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0418 Toyota Code
1. What are the common symptoms of OBDII code P0418 in a Toyota related to the Secondary Air Injection System Relay 'A' Circuit Malfunction?
- Common symptoms include rough idling, decreased engine performance, increased emissions, and the illumination of the Check Engine light.
2. What are the possible causes of OBDII code P0418 in a Toyota?
- The code P0418 in a Toyota may be triggered by a faulty secondary air injection system relay 'A', damaged wiring or connectors, or a malfunctioning secondary air injection pump.
3. How can I diagnose the cause of OBDII code P0418 in my Toyota?
- To diagnose the issue, you can start by checking the secondary air injection system relay 'A', inspecting the wiring and connectors for damage, and testing the secondary air injection pump for proper functioning.
4. What are some repair tips for addressing OBDII code P0418 in a Toyota?
- Repair tips for resolving code P0418 may include replacing the faulty secondary air injection system relay 'A', repairing any damaged wiring or connectors, and testing or replacing the secondary air injection pump if necessary.
5. Is it safe to continue driving my Toyota with OBDII code P0418 related to the Secondary Air Injection System Relay 'A' Circuit Malfunction?
- It is generally not recommended to continue driving your Toyota with code P0418 unresolved, as it can lead to decreased engine performance, increased emissions, and potential damage to other components.
6. Can OBDII code P0418 in a Toyota be fixed without professional help?
- While some DIY enthusiasts may be able to address code P0418 by replacing the relay or checking the wiring, it is recommended to seek professional help for a thorough diagnosis and proper repair.
7. How much does it typically cost to repair OBDII code P0418 in a Toyota?
- The cost of repairing code P0418 in a Toyota can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.
8. Will resetting the Check Engine light resolve OBDII code P0418 in a Toyota?
- Simply resetting the Check Engine light will not fix the underlying issue causing code P0418. It is important to diagnose and address the root cause of the problem to prevent it from reoccurring.
9. Can extreme weather conditions affect the likelihood of OBDII code P0418 appearing in a Toyota?
- Extreme weather conditions such as excessive heat or cold can sometimes put additional strain on the secondary air injection system components, potentially increasing the chances of code P0418 appearing.
10. How often should the secondary air injection system in a Toyota be inspected to prevent OBDII code P0418 from occurring?
- It is recommended to include the inspection of the secondary air injection system as part of regular maintenance checks, such as during scheduled services or whenever you notice any symptoms related to its malfunction.
Discuss the causes and fixes for P0418 Toyota OBDII Code
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Toyota Fortuner 2006
Encounter Secondary Air Injection System Relay A Circuit fault after cleaning the Throttle Boby?
Any advice,
Tks -
You would only get a P0418 code if your Secondary air pump motor has been damaged or you have an open or short in its wiring. Rarely is it the air injection driver that some resources quote first. www.hewitt-tech.com makes kits that can take care of it for a fraction of the cost of replacement.
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I have a 2006 tundra with po418 and p2445 code .I replaced air pump fuse that was blown, and it blew again. please help and advise anyone.
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If is blowing the fuse then either there is a short circuit on the harness (wire from the fuse to the pump) or the pump itself is damage.
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Most often on your vehicle, when the air pump motor fails it will open circuit and cause those codes. Occasionally, when the pump motor fails it will short circuit. When this happens it can damage the air injection control driver causing itself to create a short across the big solid state "relay" which will can also be the cause of the short blowing the fuse. Our Gen I secondary air bypass kits require an extra part for the P0418 and the air injection control driver to be replaced to work but will save you from pulling the intake manifold and replacing the expensive factory components.
Our GenII units actually replace the air injection control driver(s) themselves and can take care of the P0418 without the need for any additional parts. The Gen-II units are the best solution going forward for never dealing with the system again as they are prone to failing again.
You can find our Gen-II Bypass Kits here: https://hewitt-tech.com/sto... -
Hi I've replaced secondary injection valve as first code 2441 required cleared codes then came up with P0418 as of yet not seen or located the so called relay for A side or read any comments identifying such relay So does this relay even exist????
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Let me check if I can find more information, what model and year is your Toyota?
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