O2 Oxygen Sensor Upstream Downstream for Dodge Ram 1500 (2002-2010) 3.7L 4.7L 5.7L 5.9L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2002-2010 Dodge Ram 1500 (DR/DS)

What it Does: This 4-piece oxygen sensor kit restores closed-loop air-fuel ratio and catalyst monitoring on naturally aspirated 2002-2010 Dodge Ram 1500 DR and DS models.

The Stock Dodge Ram 1500 O2 Sensor Failure

Factory zirconia sensors on DR and DS Ram 1500 trucks endure extreme heat soak, exhaust soot, and oil ash across the EKG 3.7L, EVA/EVE 4.7L, EZA/EZB 5.7L, and EML 5.9L engines. Eventually, internal heater circuits burn open and ceramic elements glaze, slowing voltage transitions. Sluggish exhaust feedback skews PCM fuel trims and triggers P0135, P0155, P0171, or false P0420/P0430 codes.

Common Symptoms of Failing OEM O2 Sensors

• Heater & Circuit DTCs: Check engine lights for P0135, P0141, P0155, or P0161.
• Fuel Trim & Catalyst Faults: Lean/rich codes (P0171/P0174) or false P0420/P0430 catalyst warnings.
• Drivability Loss: Rough idle, poor fuel mileage, fouled spark plugs, and failed emissions tests.

The Direct-Fit 4-Sensor Solution

Replacing all four sensors as a matched set eliminates bank-to-bank voltage lag on your V6 or V8 Ram 1500. Each sensor uses a fast-response zirconia element inside a stainless steel housing engineered to resist exhaust corrosion. Direct-fit factory connectors and OEM harness lengths plug straight into existing chassis plugs without cutting or splicing. Pre-coated threads prevent exhaust manifold galling during installation.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2002-2010 Dodge Ram 1500 3.7L (Naturally Aspirated)
• 2002-2009 Dodge Ram 1500 4.7L Gas (Naturally Aspirated)
• 2004-2010 Dodge Ram 1500 4.7L Flex (Naturally Aspirated)
• 2003-2009 Dodge Ram 1500 5.7L (Naturally Aspirated)
• 2002-2003 Dodge Ram 1500 5.9L (Naturally Aspirated)

Frequently Asked Questions & Fitment Warnings

Does this fit the DR and DS Ram 1500?

Yes. Fits naturally aspirated 2002-2010 Ram 1500 (DR/DS) 3.7L, 4.7L, 5.7L (2003-2009), and 5.9L models. Excludes 2010 5.7L, 8.3L, and 2011+ trucks.

Will this clear O2 and P0420/P0430 codes?

Yes, if sensor-related. New sensors restore proper switching voltage to clear P0135–P0161 faults, though failed catalytic converters require replacement if P0420/P0430 persists.

Are connectors plug-and-play?

Yes. OEM-style connectors plug directly into factory harnesses; torque sensors to spec and clear PCM codes after installation.

The Dodge Heavy-Duty Standard

Built for towing heat and high-mileage duty, these sensors maintain accurate closed-loop fueling across both cylinder banks. Reliable exhaust feedback protects your converters and keeps your Ram 1500 CEL-free.