P1422 Toyota Code - Fuel Tank Small leak
Quick Answer
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. Common causes include Faulty EVAP Purge solenoid, Missing or loose fuel cap, Incorrect fuel filler cap used. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1422 Toyota indicates Fuel Tank Small leak.
- Common causes
- Common causes include Faulty EVAP Purge solenoid, Missing or loose fuel cap, Incorrect fuel filler cap used.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1422 Toyota Description
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
What are the Possible Causes of the DTC P1422 Toyota?
- Faulty EVAP Purge solenoid
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
How to Fix the DTC P1422 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1422 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.
Need more information about the P1422 Toyota code?
Need more information on how to fix the P1422 Toyota code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1422 Toyota code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1422 Toyota Code
1. What are the common symptoms of OBDII code P1422 Toyota (Fuel Tank Small leak)?
- The common symptoms include the check engine light coming on, the smell of gasoline around the vehicle, and potential difficulty starting the engine.
2. What are the possible causes of OBDII code P1422 Toyota?
- The code P1422 is typically triggered by issues such as a loose or damaged fuel cap, a cracked or damaged fuel tank, or a faulty vapor pressure sensor.
3. How can I diagnose the cause of OBDII code P1422 Toyota?
- To diagnose the issue, you can start by checking the fuel cap for tightness and any visible damage. You may also need to inspect the fuel tank and vapor pressure sensor for any signs of cracks or wear.
4. How can I repair a small fuel tank leak causing OBDII code P1422?
- Repairing a small fuel tank leak may involve tightening or replacing the fuel cap, repairing any cracks in the fuel tank, or replacing a faulty vapor pressure sensor. It's important to address the root cause of the leak to clear the code.
5. Can I continue driving with OBDII code P1422 Toyota?
- While the vehicle may still be operational with this code, it's recommended to address the issue promptly to prevent potential fuel leaks, reduce emissions, and ensure optimal engine performance.
6. Will OBDII code P1422 Toyota cause any long-term damage if left unresolved?
- Ignoring OBDII code P1422 can lead to fuel wastage, increased emissions, and potential safety hazards due to fuel leaks. It's best to address the issue as soon as possible to prevent any long-term damage.
7. How much does it typically cost to repair OBDII code P1422 Toyota?
- The cost of repairing OBDII code P1422 can vary based on the specific cause of the issue. Simple fixes like tightening the fuel cap may be inexpensive, while repairing a damaged fuel tank or replacing a sensor can be more costly.
8. Can a DIY enthusiast fix OBDII code P1422 Toyota at home?
- Depending on the cause of the code, DIY enthusiasts may be able to address OBDII code P1422 by tightening the fuel cap or checking for visible damage. However, more complex repairs may require professional assistance.
9. How long does it take to repair OBDII code P1422 Toyota?
- The repair time for OBDII code P1422 can vary based on the cause of the issue and the complexity of the repair. Simple fixes like tightening the fuel cap can be done quickly, while more involved repairs may take longer.
10. Is it necessary to reset the OBDII system after repairing code P1422 Toyota?
- After repairing OBDII code P1422, it's recommended to reset the OBDII system to clear the code and ensure that the issue has been successfully addressed. This can be done using an OBDII scanner or by disconnecting the vehicle's battery for a short period.
Discuss the causes and fixes for P1422 Toyota OBDII Code
-
What model and year is your Toyota? You could start by checking the gas cap.
-
The gas cap is the most common problem for this code. Did you check that? If the cap is OK, the you may have to replace the EVAP canister.
-
I've had 3 gas caps tested, one shop owner and 2 different Toyota dealerships. p142200 cleared 3 times. After 2 major tests 1) wait for Code to come back, 2) pending code still there 3) one not Toyota said no evap code now. Warranty is up in 48 hours. Letters written for more information on what 3rd party dealer repair warranty will cover if any. No response. Apparently 7 hours of work done to check. Cannot fix what isn't broken so no claim started because no code?
owner
-
That situation is frustrating, but it actually happens fairly often with small EVAP leak codes like P1422.
A “small leak” code means the EVAP system detected a very tiny leak during its self-test. The tricky part is that the test only runs under certain conditions (usually during a cold start with the fuel level between certain limits), so the code may show as pending for a while before it turns into a confirmed check engine light.
If the code was cleared and only comes back as pending, the shop may not be able to start a repair claim yet because the system hasn’t failed a full drive cycle again.
Since three gas caps have already been checked, the cap is probably not the issue. On Toyotas, small EVAP leaks are more commonly caused by:
• A very small crack in an EVAP hose
• A leaking purge or vent valve
• A weak sealing surface at the fuel filler neck
• A charcoal canister vent valve not sealing completely
• A fuel tank pressure sensor giving inconsistent readingsEven with smoke testing, very small leaks can be difficult to catch if the system isn’t currently failing the test.
One thing I would recommend before your warranty expires is asking the dealer to document the pending code and the EVAP test results in writing on the repair order. That way there is proof the issue existed while the vehicle was still under warranty, even if it hasn’t fully set the code again yet.
Sometimes the best approach with EVAP leaks is simply driving the vehicle through a few normal cycles and letting the system run its self-test again. If the leak is still present, the code will eventually return as a confirmed fault and be easier to diagnose.
The important part right now is making sure it’s officially recorded before the warranty expires.
-
-
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
