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Home >> Infiniti >> 2021 >> Q50 Pure, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 6) >> Engine (ECM) >> P0430 Three Way Catalyst Function >> DTC Description >> VR30DDTT engine >> DTC Detection Logic
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DTC Detection Logic

The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2.

A three way catalyst 1 with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst 1 malfunction is diagnosed.

G04074074Courtesy of NISSAN NORTH AMERICA, INC.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P0430

TW CATALYST SYS-B2

(Catalyst system efficiency below threshold bank 2)
  • Three way catalyst (manifold) does not operate properly.
  • Three way catalyst (manifold) does not have enough oxygen storage capacity.
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