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Tim West
Tim West, ASE Certified Technician
Category: Car
Satisfied Customers: 4638
Experience:  ASE Certified Service Manager for Bridgstone/ Firestone
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car inspected wre do i look for fixing this problem

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i have code 420 and 440 in computer and cant get car inspected wre do i look for fixing this problem
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This problem is due to a bad catyletic converters on both banks.
When diagnosing a PCM code or codes: P0420, P0430, be sure to determine the cause of the converter failure. These converters are not likely to fail without an external cause. Typical causes are: fuel pressure regulator leak, engine misfire, dirty fuel injectors, coolant consumption, etc. Also, be aware that some converters on the market will cause this code or codes due to a lack of oxygen storage capacity. A component that must be in these converters, Cerium, is required to store, then slowly release oxygen.
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Customer: replied 7 years ago.
what about code 440 were should i look
Correction, this vehicle has one cat converter. My fault I saw po420 and po430.
A p0440 is a gas cap or bad purge valve.

EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE REPLACEMENT

REMOVAL PROCEDURE

  1. Disconnect the evaporative emission (EVAP) canister purge valve harness connector.
  2. Disconnect the vacuum pipe from the EVAP canister purge valve.
  3. Disconnect the purge pipe from the EVAP canister purge valve.


  1. Remove the EVAP canister purge valve and bracket.
  2. Remove the EVAP canister purge valve from the purge bracket.
  3. Inspect for carbon release in the EVAP canister purge valve ports. Refer to Evaporative Emission (EVAP) System Cleaning.

INSTALLATION PROCEDURE

  1. Install the EVAP canister purge valve on to the purge bracket.


  1. Install the EVAP canister purge valve and bracket. NOTE: Refer to Fastener Notice in Service Precautions. Tighten Tighten the purge bracket nut to 8 N.m (71 lb in) .
  2. Connect the purge pipe to the EVAP canister purge valve.
  3. Connect the vacuum pipe to the EVAP canister purge valve.
  4. Connect the EVAP canister purge valve harness connector.
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