O2 Oxygen Sensor Upstream Downstream for Volvo S80 (2007-2010) 4.4L

Direct-Fit O2 Oxygen Sensor Kit for 2007-2010 Volvo S80 (P3)

What it Does: This 4-sensor kit monitors pre- and post-catalyst exhaust oxygen on the P3 2007-2010 Volvo S80 B8444S 4.4L V8 to regulate fueling.

The Stock Volvo S80 Oxygen Sensor Failure

Factory oxygen sensors on the P3 chassis with the B8444S 4.4L V8 fail from thermal cycling fatigue, carbon fouling, and internal heater burnout. Concentrated V8 exhaust manifold heat soak fractures the zirconia ceramic sensing element and degrades voltage switching speed. When reference passages clog or heater resistance spikes, the ECM logs codes like P0130, P0135, P0150, or P0420/P0430 and reverts to rich open-loop fueling.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: P0130, P0135, P0150, or P0420/P0430 trigger from slow switching or heater faults.
• Rich Running & Rough Idle: Biased voltage signals cause over-fueling, fouled plugs, and uneven idle.
• Failed Emissions & Poor MPG: Open-loop control increases tailpipe hydrocarbons and drops highway fuel economy.

The Direct-Fit Heated Zirconia Oxygen Sensor Solution

This matched 4-sensor kit replaces both upstream and downstream sensors corresponding to OEM numbers MHK500870 and 30774700. Each unit features a high-purity zirconia ceramic sensing element inside a laser-welded stainless steel housing with a double-layered porous shield to resist thermal and moisture shock. Factory-matched harnesses and weather-sealed connectors ensure exact heater resistance and rapid light-off, restoring tight closed-loop lambda control on the B8444S 4.4L V8 without splicing.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2007 Volvo S80 4.4L V8 (from chassis/VIN 35288)
• 2008-2010 Volvo S80 4.4L V8
• Volvo XC90 4.4L V8 (shared row; verify VIN)
• Excludes 3.2L and other S80 engines

Frequently Asked Questions & Fitment Warnings

Does this fit the P3 S80?

Yes. Fits 2007-2010 Volvo S80 B8444S 4.4L V8 (2007 from VIN 35288). Excludes 3.2L and other S80 engines; verify VIN first.

Will this clear P0130/P0420 codes and replace all sensors?

Yes. Replacing all 4 sensors resolves P0130/P0150 switching faults and restores catalyst monitoring for P0420/P0430 diagnostics.

Are OEM connectors included for direct installation?

Yes. All four include factory connectors; lightly coat threads only with O2-safe anti-seize before installation.

The Volvo Precision Standard

Matched lambda feedback maintains tight closed-loop fueling on your P3 S80 for clean emissions and CEL-free operation.