MazicBay Diagnostics
MAZICBAYDiagnostics
FTC Reader Disclosure: When you purchase or register through links on our site, we may earn an affiliate commission at no extra cost to you. Read our Editorial & Advertising Policy.

P0137 on Ford F-150

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Factory diagnostic protocol and troubleshooting wire for fault code P0137 specifically for the Ford F-150 (2020–2026, 3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid).

Verified OEM Telemetry & Field Repair Tree
Ford F-1502020–2026
Ford F-150
Truck3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid
Reliability
Sensor Voltage Ref
0.1V – 5.0V Ref
F-150 SAE Mode $01
ECU Network Bus
500 kbps CAN-FD
ISO 15765-4 Compliant
Drivability Status
Drivable (Short Trip)
Low urgency level
Est. Repair Cost
$100 - $300 (DIY: $35 - $100)
Parts & Labor DIY
Check P0137 On Another Ford Model:
Diagnose P0137 on Specific F-150 Model Year:

1. Symptoms of P0137 on Ford F-150

When the Engine Control Module (ECM/PCM) on your Ford F-150 (3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid) logs fault code P0137, drivers commonly observe:

Check Engine Light on on Ford F-150 (3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid)
Downstream sensor voltage consistently below 0.15V on scan tool on Ford F-150 (3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid)
Failed emissions test on Ford F-150 (3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid)
Ford F-150 OBD-II Port Location
The 16-pin diagnostic connector is located Under driver side dash panel, right of hood release lever. Plug in your scan tool to verify freeze-frame sensor values.

2. Most Likely Causes on Ford F-150

Historical warranty claims and technical repair bulletins for Ford F-150 point to the following failure distribution:

55%
Exhaust leak upstream of or directly at the Sensor 2 bung letting in fresh air (Ford OEM Part)
25%
Faulty downstream oxygen sensor (Ford OEM Part)
12%
Short to ground in sensor signal wire (Ford OEM Part)
8%
Extremely lean exhaust condition (Ford OEM Part)
* Source: Synthesized from NHTSA ODI field repair telemetry and verified OEM Technical Service Bulletin (TSB) repair tree frequency percentiles for Ford F-150.

3. Step-by-Step DIY Repair Guide for Ford F-150

01
Inspect Exhaust System for Leaks

Listen for exhaust ticking or black soot around flex pipe, flanges, and sensor bungs before the catalytic converter. on the Ford F-150 equipped with 3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid.

Required Tool: Flashlight, Jack Stands
02
Check Sensor Signal Voltage with Scan Tool

Monitor B1S2 voltage. Snap the throttle to enrich mixture; voltage should briefly spike above 0.8V. If it remains 0.0V–0.1V, sensor is defective or shorted. on the Ford F-150 equipped with 3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid.

Required Tool: OBD-II Scanner
03
Replace Downstream O2 Sensor

Unplug harness, remove old sensor with 7/8 socket, install replacement sensor and plug firmly. on the Ford F-150 equipped with 3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid.

Required Tool: O2 Sensor Socket, Ratchet
04
Clear Codes

Clear DTCs and verify B1S2 holds steady between 0.45V and 0.75V during steady highway cruising. on the Ford F-150 equipped with 3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid.

Required Tool: OBD-II Scanner
Recommended Parts & Testing Tools

Equipment for Diagnosing Ford F-150 (P0137)

Prime Fast Delivery & Verified Fitment
Direct-Fit Replacement Part

Ford F-150 OEM Replacement Sensor

4.7 / 5.0 (Verified Fit)

Direct-fit replacement assembly engineered to OEM tolerances for Ford F-150.

$45 – $95 Prime
Check Fitment on Amazon
Sensor Signal Voltage Meter

AstroAI Auto-Ranging Digital Multimeter

4.6 / 5.0 (Best Seller)

Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.

$29.99 Prime
View on Amazon
Top Mobile OBD-II Scanner

BlueDriver Bluetooth Pro OBDII Scan Tool

4.7 / 5.0 (50,000+ Reviews)

Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.

Compare OEM & Aftermarket Replacement Sensors for Ford F-150Verified direct-fit pricing from Denso, Bosch, Motorcraft, and ACDelco on Amazon.
Find Parts on Amazon
* As an Amazon Associate, MazicBay earns from qualifying purchases. Prices & availability subject to change.

Other Common Fault Codes on Ford F-150

Frequently diagnosed powertrain, emissions, and sensor trouble codes logged on the Ford F-150:

4. Ford F-150 P0137 FAQs

What causes code P0137 to trigger on a Ford F-150?

On the Ford F-150 (3.5L / 2.7L EcoBoost Twin-Turbo V6 / 5.0L Coyote V8 / 3.5L PowerBoost Hybrid), P0137 is most frequently caused by Exhaust leak upstream of or directly at the Sensor 2 bung letting in fresh air or Faulty downstream oxygen sensor.

Where is the OBD-II port located on my Ford F-150?

On the Ford F-150, the 16-pin DLC diagnostic connector is located Under driver side dash panel, right of hood release lever. Plug in any standard OBD-II scanner with the ignition in the ON position to read freeze-frame parameters.

Can I safely drive my Ford F-150 with code P0137?

Yes. Vehicle is fully drivable, but Check Engine Light will remain illuminated. Given that P0137 carries a Low severity rating, we advise avoiding heavy towing or aggressive throttle inputs until sensor readings are verified.