P0131 on Your 2022 Honda Odyssey
The 2022 Honda Odyssey continues with the 3.5L V6 (J35Y6, 280 hp) and 10-speed automatic. P0131 means the upstream O2 sensor on Bank 1 (rear cylinder bank on the transverse V6) is reporting persistently low voltage. At typical 2022 mileage (20,000–50,000 miles), this code suggests either a premature sensor failure, wiring problem, or exhaust leak rather than normal wear.
Finding the Sensor
Bank 1 Sensor 1 is threaded into the rear exhaust manifold on the Odyssey's V6. The van's compact engine bay puts this sensor in a tight spot between the engine and firewall. Access from underneath is the most practical approach. The sensor connects via a four-wire harness that routes through the engine-to-firewall gap.
Symptoms
- Check engine light on
- Reduced fuel economy
- Rough idle
- Hesitation on acceleration
- Failed emissions test
- ECM may over-fuel Bank 1
Causes
1. Premature O2 Sensor Failure — High Likelihood
While the sensor shouldn't be worn out at this mileage, the Odyssey's rear bank runs hot due to limited airflow in the van's engine bay. Early sensor failure from a manufacturing defect or contamination (from silicone sealant or fuel additives) is the most common cause on a 2022 model. Honda uses Denso wideband sensors that are generally reliable but not immune to early issues.
2. Wiring Damage — Medium Likelihood
The tight engine-to-firewall gap on the Odyssey puts the O2 sensor harness at risk. Heat damage, rodent bites on Honda's soy-based wiring, or a connector that wasn't fully seated during assembly can all cause low voltage at the ECM. Always check wiring before replacing the sensor.
3. Exhaust Leak — Medium Likelihood
A leak at the rear manifold gasket or at the O2 sensor bung itself introduces ambient air into the exhaust stream. This causes the sensor to genuinely read lean (low voltage). Check for soot trails at exhaust joints and listen for cold-start ticking.
4. ECM or Ground Circuit Problem — Low Likelihood
A corroded ground connection or ECM issue can cause artificially low O2 sensor readings. This is uncommon on a 2022 model but possible if there's been water intrusion or corrosion in the engine bay connectors.
Diagnostic Steps
- Monitor sensor voltage — Stuck below 0.2V or very slow response confirms the issue.
- Compare both banks — Normal Bank 2 readings help isolate the problem to Bank 1.
- Inspect wiring — Carefully check the harness between engine and firewall.
- Exhaust inspection — Check rear manifold joints for leaks.
- Heater circuit test — Verify power and resistance in the sensor heater circuit.
Repair Costs
- O2 sensor (OEM Denso): $200–$365
- Wiring repair: $100–$240
- Exhaust manifold gasket: $275–$550
- Ground repair: $75–$175
Warranty Check
The 2022 Odyssey may still be under Honda's 3-year/36,000-mile basic warranty depending on mileage. The federal emissions warranty (8 years/80,000 miles) may also cover the upstream O2 sensor. Check with your Honda dealer before paying out of pocket.
DIY or Shop?
The rear bank sensor on the Odyssey is one of the harder Honda O2 sensor locations. If you're comfortable working underneath vehicles and have a lift or good jack stands, it's doable but tight. Shop repair is worthwhile here if access is a concern.