Warm up catalyst efficiency below threshold

Tiny
KIMINIJONES
  • MEMBER
  • 2002 KIA SEDONA
  • 6 CYL
  • 125,753 MILES
Warm up catalyst efficiency below threshold (bank 2) and evaporative emission system leak detected (gross leak/ no flow.
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Monday, September 13th, 2021 AT 5:57 PM

1 Reply

Tiny
SQM
  • EXPERT
Hello,

The warm up catalytic efficiency below threshold typically points to a bad oxygen sensor. You should have 2 oxygen sensor on that bank 2 (sensor 1 and sensor 2). The code number will tell you which one might be the issue.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

The EVAP gross leak typically points to a cracked hose in the EVAP system, it can also be the vent valve staying open all the time. Any time a 'gross' leak is detected it is due to a large enough leak that the EVAP system cannot stay pressurized.

https://www.2carpros.com/articles/evap-system-code-repair

Let me know what was those code numbers and I can provide you with he factory recommended diagnostics to get this resolved.

Thank you.
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Monday, September 13th, 2021 AT 9:44 PM

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