P0131 on a 2022 Toyota Camry
O2 Sensor Low Voltage (Bank 1 Upstream)
P0131 on a 2022 Toyota Camry indicates o2 sensor low voltage (bank 1 upstream). It usually stays drivable short-term but should be diagnosed promptly. The most common cause is vacuum leak causing genuine lean condition on bank 1 (typically $80–$600). Confirm the root cause before replacing parts.
What does P0131 mean on a 2022 Toyota Camry?
P0131 is set when the ECM sees the upstream oxygen sensor on Bank 1 reporting a voltage below the calibrated minimum (typically below 0.1 V) for an extended period. The sensor is either telling the ECM that the exhaust is extremely lean — and continuing to report that even when the engine is supposedly running stoichiometric — or it has failed and is stuck at a low voltage.
This guide covers P0131 across the 2020-2024 Toyota Camry generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2020 through 2024.
Is it safe to drive a 2022 Toyota Camry with P0131?
In most cases a 2022 Toyota Camry stays drivable for short trips with P0131 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0131 on a 2022 Toyota Camry?
- Check Engine Light is illuminated
- Rough idle and hesitation
- Reduced fuel economy
- Possible black smoke from exhaust (ECM adds fuel to "correct" lean reading)
- Slight loss of power under acceleration
- May be accompanied by P0171 (system too lean Bank 1)
What causes P0131 on a 2022 Toyota Camry?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Vacuum leak causing genuine lean condition on Bank 1 | Most common | $80–$600 |
| Exhaust leak upstream of the Bank 1 upstream O2 sensor | Common | $100–$500 |
| Failed Bank 1 upstream O2 sensor (stuck low) | Common | $150–$450 |
| Shorted-to-ground O2 sensor signal wire | Common | $80–$350 |
| Low fuel pressure causing lean mixture | Occasional | $80–$900 |
| Clogged or under-flowing Bank 1 fuel injectors | Occasional | $150–$1,000 |
| Corroded O2 sensor connector | Occasional | $30–$200 |
How to diagnose this on a 2022 Toyota Camry
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Determine whether the lean condition is real or sensor-reported
Read fuel trims at idle and 2500 RPM. If Bank 1 long-term fuel trim (LTFT) is near zero, the engine is running fine and the O2 sensor is reporting a false lean — the sensor or its wiring is the problem. If LTFT is +15 % or higher, the engine is genuinely lean and the sensor is correctly reporting it.
Tools: Scan tool with live fuel trim PIDs
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Check the O2 sensor signal wire continuity
Disconnect the Bank 1 upstream O2 sensor. With the connector unplugged, the scan tool PID should read a bias voltage (often 0.4–0.5 V) rather than 0 V. If it stays pinned at 0 V, the signal wire is shorted to ground somewhere between the sensor and the PCM.
Tools: Scan tool, Multimeter
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Inspect for vacuum and exhaust leaks
Smoke-test the intake to find vacuum leaks that would cause a real Bank 1 lean condition. Then inspect the exhaust between the engine and the upstream O2 sensor — pinhole leaks pull in fresh air and bias the sensor reading low.
Tools: Smoke machine, Mechanic's stethoscope, Flashlight
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Bench-test the O2 sensor heater circuit
An O2 sensor that does not heat up will produce low voltage because the zirconium element only generates signal when hot (350 °C+). Measure the heater resistance — typically 3–15 Ω depending on the sensor. An open heater requires sensor replacement.
Tools: Multimeter
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Verify fuel pressure
Low fuel pressure causes a genuine lean mixture and will set P0131 along with P0171. Connect a fuel pressure gauge and observe at idle, snap-throttle, and steady cruise. Pressure below the OEM spec or dropping under load points at the pump or pressure regulator.
Tools: Fuel pressure gauge
Known Technical Service Bulletins for the 2020-2024 Toyota Camry
Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Toyota Camry.
- ENGINE Feb 27, 2026
OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
NHTSA #11029896 - ELECTRICAL SYSTEM Jan 30, 2026
OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
NHTSA #11028726 - ELECTRICAL SYSTEM Jan 28, 2026
Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.
NHTSA #11028722 - UNKNOWN OR OTHER Jan 7, 2026
Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manual and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines.
NHTSA #11028712 - ENGINE Aug 7, 2025
The specific condition covered by this program is for a small engine coolant leak that can occur from the flow shut-off valve that can allow coolant to drip on other parts of the vehicle. This can cause "Engine Maintenance Required" to be displayed on the instrument cluster or cause the A/C not to function normally. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
NHTSA #11022949 - ELECTRICAL SYSTEM Jun 25, 2025
Some 2021 – 2022 model year Avalon, 2018 – 2024 Camry, 2019 – 2025 model year Corolla, 2022 – 2025 model year Corolla Cross, and 2019 – 2025 model year RAV4 vehicles with A25A-FKS and M20A-FKS engines may have a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs) upon cold soak start up with engine coolant temperatures between 14°F – 41°F: •P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold •P030000 – Random/Multiple Cylinder Misfire Detected •P030100 – Cylinder 1 Misfire Detected •P030200 – Cylinder 2 Misfire Detected •P030300 – Cylinder 3 Misfire Detected •P030400 – Cylinder 4 Misfire Detected
NHTSA #11020670
+14 more TSBs available in MECH AI's TSB explorer for this vehicle.
NHTSA complaints & recalls for the 2022 Toyota Camry
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2022 Toyota Camry. Use these to gauge how common a problem is on your specific vehicle before you start chasing Toyota Camry diagnostics.
- VEHICLE SPEED CONTROL 6
- AIR BAGS 10
- UNKNOWN OR OTHER 7
- SERVICE BRAKES 7
- ELECTRICAL SYSTEM 7
1 active recall
- AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION Dec 2023
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2020-2021 Avalon, Avalon Hybrid, Corolla, Highlander, Highlander Hybrid, RAV4, RAV4 Hybrid, Lexus ES350, Lexus RX350, Lexus RX450H, 2021 Sienna Hybrid, Lexus ES250, 2020-2022 Camry, Camry Hybrid, and ES300H ve…
NHTSA campaign 23V865000
How do I fix P0131 on a 2022 Toyota Camry?
- Repair vacuum leak(s) on Bank 1 intake
- Repair exhaust leak(s) upstream of the front O2 sensor
- Replace the Bank 1 upstream O2 sensor with an OEM part
- Repair shorted-to-ground O2 signal wire
- Service fuel system if low pressure is confirmed
About the 2020-2024 Toyota Camry
The 2020-2024 Toyota Camry was commonly sold with the following powertrains: 2.5L I4, 3.5L V6, 2.5L Hybrid I4. Common trims include LE, SE, XLE, XSE.
How to tell a sensor problem from a real lean condition
P0131 by itself, with normal fuel trims, is almost always a sensor or wiring problem. P0131 paired with P0171 (system too lean Bank 1) is almost always a real lean condition that the sensor is correctly reporting. The fuel trim reading is the deciding piece of data.
O2 sensor replacement: OEM vs aftermarket
Wide-band oxygen sensors used in modern emissions systems are calibrated devices. Generic aftermarket sensors sold at half the OEM price often have different response curves, which causes the ECM’s fuel trim algorithm to misbehave even though the sensor “works.” Buy NTK, Denso, or Bosch OEM-equivalent — and confirm the part is listed for your specific year, make, model, engine, and emissions package (federal vs. California).
Lean caused by ethanol mixed fuel
A handful of P0131 cases on rural-use vehicles trace back to higher ethanol content in the fuel (E20+ instead of E10). The wide-band sensor is fine; the fuel is leaner than the ECM expects. If P0131 appeared right after a fill-up at an unfamiliar station, try a tank of premium-grade gasoline from a major-brand station and recheck.
P0131 on a 2022 Toyota Camry: frequently asked questions
What does diagnostic trouble code P0131 mean on a 2022 Toyota Camry?
P0131 is set when the ECM sees the upstream oxygen sensor on Bank 1 reporting a voltage below the calibrated minimum (typically below 0.1 V) for an extended period. The sensor is either telling the ECM that the exhaust is extremely lean — and continuing to report that even when the engine is supposedly running stoichiometric — or it has failed and is stuck at a low voltage.
What are the symptoms of P0131 on a 2022 Toyota Camry?
Check Engine Light is illuminated. Rough idle and hesitation. Reduced fuel economy. Possible black smoke from exhaust (ECM adds fuel to "correct" lean reading). Slight loss of power under acceleration. May be accompanied by P0171 (system too lean Bank 1)
What causes P0131 on a 2022 Toyota Camry?
Vacuum leak causing genuine lean condition on Bank 1 (most-common). Exhaust leak upstream of the Bank 1 upstream O2 sensor (common). Failed Bank 1 upstream O2 sensor (stuck low) (common). Shorted-to-ground O2 sensor signal wire (common). Low fuel pressure causing lean mixture (occasional). Clogged or under-flowing Bank 1 fuel injectors (occasional). Corroded O2 sensor connector (occasional)
Is it safe to drive a 2022 Toyota Camry with P0131?
In most cases a 2022 Toyota Camry stays drivable for short trips with P0131 active, but it should be diagnosed and repaired promptly — this is a moderate-severity code. Ignoring it can lead to further damage or a failed emissions test.