P1442 – EVAP System Leak Detected

What is the P1442 code and how urgent is it?

The P1442 code indicates a problem with the secondary air injection system, specifically that the secondary air injection system switching valve is stuck closed on bank 1. This code is specific to Toyota and Lexus vehicles.

While this is an emissions-related issue and will not prevent you from driving the vehicle in the short-term, it's best to diagnose and fix the underlying problem promptly. Driving with the check engine light on for extended periods can potentially cause further damage. If you are unsure, it's always safest to have the vehicle towed to a mechanic or dealership for diagnosis.

What parts are involved and what do they do?

The main components involved with a P1442 code are:

• Secondary air injection pump: Pumps fresh air into the exhaust stream to help reduce emissions during a cold start
• Secondary air injection switching valves: Control the flow of air from the pump into the exhaust manifold. Typically there is one valve per bank on a V-configuration engine
• Vacuum switching valves: Control vacuum to the air switching valves

Common causes of a P1442 code

Some frequent reasons for a P1442 code to be triggered include:

• Faulty secondary air injection pump (a loud squealing noise at startup is a common symptom)
• Stuck open or stuck closed air switching valve
• Damaged vacuum lines to the air switching valves
• Electrical issues with the air injection system components

Diagnosing a P1442 code

To properly diagnose a P1442 code, a mechanic will typically:

1. Visually inspect the air injection system components, hoses, and wiring
2. Test the operation of the air pump
3. Use a vacuum gauge to test the operation of the air switching valves
4. Check for power and ground at the electrical connectors
5. Consult factory service information for further diagnostic steps

Repair options and costs

Depending on the root cause, fixing a P1442 code may involve:

• Replacing the secondary air injection pump ($300-600 USD / €280-560 EUR for the part plus 1-2 hours labor)
• Replacing one or both air switching valves ($100-300 USD / €95-280 EUR each plus 1-2 hours labor)
• Replacing damaged vacuum lines ($20-50 USD / €19-47 EUR for parts plus 0.5-1 hour labor)
• Repairing wiring issues (cost varies)

Alternatively, some aftermarket companies like Hewitt Tech offer bypass kits that eliminate the secondary air injection system entirely for around $200-300 USD. While this removes the emissions benefits, it can be a more cost-effective solution for older, high-mileage vehicles.

Preventing future P1442 codes

While the secondary air injection system is a wear item that may eventually fail due to age and mileage, some steps to prolong its life include:

• Ensuring regular oil changes with the correct oil type to minimize contaminants in the exhaust
• Fixing any exhaust leaks promptly, as they can allow debris to enter the air injection system
• Addressing any rough running or misfiring conditions that put excess strain on the emissions components

Related issues

Some other codes that may appear along with P1442 include:

• P1441 – Secondary air injection valve stuck open on bank 1
• P0410 – Secondary air injection system malfunction
• P2441 – Secondary air injection valve stuck closed on bank 1

In summary, while a P1442 code is emissions-related, it's best to diagnose and repair it promptly to prevent potential further damage. If you are not comfortable with the diagnosis, do not hesitate to seek the assistance of a professional mechanic. For older, high-mileage vehicles, a secondary air injection bypass kit may be the most cost-effective long-term solution.

Frequently Asked Questions About P0472

What is the P1442 code and what does it mean?

The P1442 code indicates that the secondary air injection system switching valve is stuck closed on bank 1. This code is specific to Toyota and Lexus vehicles. The secondary air injection system helps reduce emissions by injecting fresh air into the exhaust stream during a cold start.

Is it safe to drive with a P1442 code?

While a P1442 code will not prevent you from driving the vehicle in the short-term, it's best to diagnose and fix the underlying problem promptly. Driving with the check engine light on for extended periods can potentially cause further damage. If you are unsure, it's safest to have the vehicle towed to a mechanic.

What are the common symptoms of a P1442 code?

Typically there are no noticeable performance symptoms associated with a P1442 code. The only indicator is usually the check engine light being illuminated. In some cases, you may hear a loud squealing noise from the secondary air injection pump at startup.

What are the common causes of a P1442 code?

Common causes include:

• Faulty secondary air injection pump
• Stuck open or stuck closed air switching valve
• Damaged vacuum lines to the air switching valves
• Electrical issues with the air injection system components

What parts are involved with the P1442 code?

The main components are:

• Secondary air injection pump
• Secondary air injection switching valves (one per bank on V engines)
• Vacuum switching valves that control the air valves

How do you diagnose a P1442 code?

A mechanic will typically:

1. Visually inspect the air injection system components, hoses, and wiring
2. Test the operation of the air pump
3. Use a vacuum gauge to test the air switching valves
4. Check for power and ground at the electrical connectors
5. Consult factory service information for further steps

Can I diagnose the P1442 code myself?

Diagnosing a P1442 code requires intermediate mechanical knowledge and special tools like a scan tool and vacuum gauge. If you are not comfortable with auto repair, it's best to have a professional diagnose your vehicle.

How much does it cost to fix a P1442 code?

Depending on the cause, repair costs can range from $20 for a vacuum line up to $600 or more to replace the air injection pump. Typical repair costs are:

• Air pump: $300-600
• Air switching valve: $100-300 each
• Vacuum lines: $20-50
• Electrical repairs: Cost varies

Is there a way to bypass the air injection system?

Some aftermarket companies sell bypass kits to eliminate the secondary air injection system for around $200-300. While this removes the emissions benefits, it can be a cost-effective solution for older, high-mileage vehicles. Check your local emissions laws.

Will a P1442 code cause my vehicle to fail an emissions test?

Yes, in most areas a P1442 code will cause your vehicle to fail an emissions or smog check. The secondary air injection system is an important emissions control device.

Can an exhaust leak cause a P1442 code?

While an exhaust leak will not directly cause a P1442 code, it can allow unmetered air to enter the exhaust and potentially damage the air injection system components over time. Any exhaust leaks should be fixed.

Can a vacuum leak cause a P1442 code?

Yes, a vacuum leak in the lines going to the air switching valves can cause the valves to stay stuck open or closed, triggering a P1442 code. Check the vacuum lines for cracks, kinks or loose connections.

Can a weak battery cause a P1442 code?

While a weak battery will not directly trigger a P1442 code, low voltage can cause erratic behavior in sensitive electronic components like the air injection valves and relays. Make sure the battery is fully charged and in good condition.

Can a blown fuse cause a P1442 code?

Yes, if the fuse that controls the air injection pump or valves is blown, it can trigger a P1442 code. Check the fuses before replacing any components. Consult a wiring diagram to locate the relevant fuse.

Can a P1442 code trigger other codes?

P1442 is usually the only code that directly relates to the secondary air injection system. However, the root cause (e.g. an exhaust leak or rough running condition) may trigger additional codes. Always diagnose and repair codes in the order they occurred.

What are some other common codes that may appear with P1442?

Related codes include:

• P1441 – Secondary air injection valve stuck open on bank 1
• P0410 – Secondary air injection system malfunction
• P2441 – Secondary air injection valve stuck closed on bank 1

Is a P1442 code the same as a P0410 code?

While both codes relate to the secondary air injection system, a P0410 code is a generic OBD-II code that indicates a general system malfunction. A P1442 code is manufacturer-specific and indicates the air valve is stuck closed on bank 1.

Will disconnecting the battery erase a P1442 code?

Disconnecting the battery will clear the code from the PCM's memory, but it will not fix the underlying problem. The code will return once the faulty condition is detected again. Always diagnose and repair the root cause.

How often should I replace my air injection pump?

The air injection pump is a wear item that may eventually fail due to age and mileage. On most vehicles it is not a regularly scheduled maintenance item. If the pump is noisy or has failed, replacement is necessary to avoid a P1442 code.

What should I do if the P1442 code keeps coming back?

If the P1442 code persists after repairs, there may be an intermittent fault or additional problem that was not diagnosed. Consult a professional mechanic for a thorough diagnosis, especially if you have already replaced air injection components.