P1422 Lexus 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 Lexus 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 Lexus 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 Lexus?
- 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 Lexus?
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 Lexus 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 P1422 Lexus Code
1. What does the P1422 code mean on a Lexus?
P1422 indicates a small fuel tank leak detected in the evaporative emission control (EVAP) system, which prevents fuel vapors from escaping into the atmosphere.
2. What are the symptoms of a P1422 code in a Lexus?
Symptoms may include the check engine light turning on, a slight fuel odor, and potential difficulty passing an emissions test. Otherwise, the car may drive normally.
3. What causes the P1422 code on a Lexus?
Common causes include a loose or damaged gas cap, a crack in the EVAP hoses or fuel tank, a faulty purge valve, or a malfunctioning leak detection pump.
4. Can a loose gas cap trigger the P1422 code?
Yes, a loose, damaged, or improperly sealed gas cap is one of the most common causes of the P1422 code.
5. How do I fix the P1422 code on my Lexus?
Start by tightening or replacing the gas cap. If the code persists, inspect the EVAP system components for leaks, including hoses, valves, and the fuel tank.
6. How much does it cost to repair a P1422 code on a Lexus?
Costs vary depending on the issue. Replacing a gas cap may cost $20-$50, while repairing or replacing EVAP components can range from $100 to $700 or more.
7. Can I drive my Lexus with a P1422 code?
Yes, you can drive with this code, but it’s best to address it promptly to avoid potential EVAP system damage and to ensure emissions compliance.
8. How is the P1422 code diagnosed on a Lexus?
A technician will use an OBDII scanner to read the code, visually inspect the EVAP system for leaks, and perform a smoke test to pinpoint leaks if necessary.
9. Does a P1422 code affect fuel efficiency?
Typically, the P1422 code does not directly impact fuel efficiency, but it should still be resolved to ensure proper EVAP system function.
10. Will clearing the P1422 code fix the issue?
Clearing the code will turn off the check engine light temporarily, but if the underlying issue isn’t fixed, the P1422 code will return.
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