O2 Oxygen Sensor Upstream Downstream for RAM ProMaster (2014-2021) 3.6L

Direct-Fit Upstream & Downstream O2 Oxygen Sensor Kit for 2014-2021 RAM ProMaster (VF)

What it Does: This matched four-piece O2 sensor kit monitors pre- and post-catalyst exhaust oxygen on 2014-2021 RAM ProMaster (VF) ERB 3.6L Pentastar V6 models for closed-loop fueling.

The Stock RAM ProMaster Oxygen Sensor Failure

Factory O2 sensors on the VF ProMaster endure severe thermal cycling and exhaust condensation inside the ERB 3.6L Pentastar V6 manifolds and y-pipe. Over high mileage, zirconia sensing elements suffer carbon fouling, silicone contamination, or thermal shock fracture. Internal heater circuits also degrade, triggering resistance codes like P0135 and P0141. Once switching slows, the PCM loses lambda accuracy, setting P0133 and erratic fuel trims.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light / DTCs: Triggers P0135, P0141, P0133, or P0171/P0174 from sluggish voltage switching or heater failure.
• Rich Fueling & Fouled Plugs: Skewed upstream air-fuel data forces rich open-loop operation under load.
• Failed Emissions Testing: Sluggish downstream cross-counts trigger false P0420/P0430 warnings and poor fuel economy.

The Direct-Fit Heated Zirconia Oxygen Sensor Solution

This matched four-sensor kit restores rapid lambda switching across Bank 1 and Bank 2 on the VF platform. Laser-welded stainless housings shield high-purity zirconia ceramic elements against exhaust moisture and thermal shock. Factory-crimped harnesses and OEM-profile connectors eliminate wiring splices or signal resistance drops. Direct-fit thread geometry seats cleanly in stock bungs for leak-free sealing and immediate closed-loop PCM synchronization.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2014-2021 RAM ProMaster (3.6L) — Upstream & Downstream Positions

Frequently Asked Questions & Fitment Warnings

Does this fit the VF ProMaster?

Yes. Direct fit for 2014-2021 RAM ProMaster models with the ERB 3.6L Pentastar V6. Excludes 3.0L EcoDiesel and 2022+ ERC 3.6L engines; confirm engine before ordering.

Will this clear P0135, P0141, or P0420/P0430 codes?

Yes, when sensors are at fault. Resolves heater and response DTCs, while persistent P0420/P0430 codes indicate catalytic converter failure.

Are connectors direct-fit without splicing?

Yes. Each sensor includes OEM-style connectors replacing 234-4029, 234-4228, and 234-4229; chase bung threads and torque properly.

The RAM Heavy-Duty Standard

Commercial VF vans rely on accurate exhaust telemetry to handle heavy payload heat without downtime. Replacing all four sensors together balances Bank 1 and Bank 2 fuel trims.