OBD Guide
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P143F

Evaporative Emission System Afterrunning Diagnosis

P143F is an OBD-II diagnostic trouble code meaning: Evaporative Emission System Afterrunning Diagnosis. Common causes: evap purge valve malfunction, leak in the evaporative emission system. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Check Engine light comes on
  • Slight increase in fuel consumption
  • The smell of gasoline in or around the car
  • Problems starting the engine in rare cases

Causes

  • EVAP purge valve malfunction
  • Leak in the evaporative emission system
  • Damaged or clogged carbon adsorber
  • Problems with the fuel tank pressure sensor
  • Open or short circuit in control circuit

How to Fix

  1. Check the EVAP system for leaks
  2. Diagnose the operation of the purge valve
  3. Check the condition of the carbon adsorber
  4. Test the fuel tank pressure sensor
  5. Check the integrity of the system wiring harness

Related codes

P0440P0442P0455

FAQ

What does the P143F code mean?

P143F is an OBD-II diagnostic trouble code that indicates: Evaporative Emission System Afterrunning Diagnosis

What causes a P143F error code?

The most common causes of P143F include: EVAP purge valve malfunction; Leak in the evaporative emission system; Damaged or clogged carbon adsorber; Problems with the fuel tank pressure sensor.

How do I fix a P143F diagnostic trouble code?

To fix P143F: Check the EVAP system for leaks. Diagnose the operation of the purge valve. Check the condition of the carbon adsorber. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P143F?

Yes, but get it checked soon

How much does it cost to fix P143F?

The estimated repair cost for P143F is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat