P0431 on Nissan
Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0431 on Nissan vehicles indicates warm up catalyst efficiency below threshold (bank 2). Au7o has documented this code across 1 Nissan model — most commonly on Armada. On vehicles with a primary/warm-up catalyst, the PCM determines the Bank 2 warm-up catalyst (WU-TWC) is below its efficiency threshold, based on the upstream/downstream O2 sensor comparison for that bank. Typical repair costs on Nissan range from $900 to $3,500, depending on the specific model and root cause.
Common Causes of P0431
- •Worn/failed Bank 2 warm-up catalytic converter
- •Aged or contaminated O2 sensor on Bank 2
- •Exhaust leak near the warm-up catalyst
- •Misfire or improper air/fuel on Bank 2
- •Oil/coolant contamination
P0431 on Nissan by Model
Nissan Armada(1 issue)
- Catalytic Converter Substrate Disintegration Clogging the Downstream Converter2004-2015
The TA60 runs close-coupled converters bolted to the manifolds plus secondary converters downstream. Owners repeatedly report the ceramic substrate in an upstream converter breaking apart, at which point the loose material blows downstream and packs the secondary converter, choking the exhaust. Symptoms progress from a P0420/P0430 efficiency code to a rattle from the exhaust, then to a truck that will not pull, runs hot, and feels like it has lost half its power because it cannot exhale. Because the same codes are also set by lazy oxygen sensors, plenty of owners replace sensors first and are surprised when the codes come back.
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View P0431 across all makes →Frequently Asked Questions
What does P0431 mean on Nissan?▼
P0431 stands for "Warm Up Catalyst Efficiency Below Threshold (Bank 2)." On vehicles with a primary/warm-up catalyst, the PCM determines the Bank 2 warm-up catalyst (WU-TWC) is below its efficiency threshold, based on the upstream/downstream O2 sensor comparison for that bank. On Nissan specifically, this code is documented across 1 model.
What causes P0431 on Nissan vehicles?▼
Common causes on Nissan: Worn/failed Bank 2 warm-up catalytic converter, Aged or contaminated O2 sensor on Bank 2, Exhaust leak near the warm-up catalyst, Misfire or improper air/fuel on Bank 2, Oil/coolant contamination. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0431 on a Nissan?▼
Repair costs on Nissan range from $900 to $3,500, depending on the specific model and root cause.
Which Nissan models have P0431 documented?▼
Au7o has documented P0431 on 1 Nissan model: Armada.