P1421 Lexus Code - EVAP Canister Gross Leak
Quick Answer
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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
- P1421 Lexus indicates EVAP Canister Gross Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- 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 P1421 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 P1421 Lexus?
- 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
- Faulty EVAP Purge solenoid
How to Fix the DTC P1421 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 P1421 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 P1421 Lexus Code
1. What does the OBDII code P1421 mean on a Lexus?
Code P1421 indicates an EVAP canister gross leak, meaning there is a significant leak in the vehicle's evaporative emissions system.
2. What are the common symptoms of code P1421 on a Lexus?
Symptoms may include a check engine light, increased fuel smell near the vehicle, reduced fuel efficiency, or failed emissions testing.
3. What causes the P1421 code to appear?
Common causes include a damaged EVAP canister, faulty purge or vent valves, loose or broken hoses, or a missing or improperly sealed gas cap.
4. Can a loose gas cap trigger the P1421 code?
Yes, a loose or damaged gas cap can cause a gross leak in the EVAP system, leading to this code.
5. How do you diagnose the P1421 code on a Lexus?
A mechanic will inspect the EVAP system components, check for leaks using a smoke test, and verify the condition of the gas cap and hoses.
6. Is it safe to drive with the P1421 code on a Lexus?
While the vehicle may still run, driving with this code can lead to higher emissions and reduced fuel efficiency, so it’s best to address it promptly.
7. How is the P1421 code fixed on a Lexus?
Repairs may involve replacing the EVAP canister, fixing or replacing damaged hoses, installing a new gas cap, or repairing malfunctioning purge or vent valves.
8. How much does it cost to repair a P1421 code on a Lexus?
Costs can vary, but repairing an EVAP leak typically ranges from $100 to $600, depending on the parts and labor involved.
9. Can the P1421 code affect fuel efficiency?
Yes, an EVAP system leak can lead to reduced fuel efficiency due to the loss of fuel vapors that would otherwise be recycled.
10. Will clearing the P1421 code fix the problem?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.
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