O2 Oxygen Sensor Upstream Downstream for Volvo V70 (2005-2007) 2.5L Turbo

Direct-Fit O2 Oxygen Sensor Kit for 2005-2007 Volvo V70 (P2)

What it Does: This matched upstream and downstream oxygen sensor kit restores closed-loop fueling and catalyst monitoring on the 2005-2007 P2 Volvo V70 B5254T2 2.5L Turbo.

The Stock Volvo V70 Oxygen Sensor Failure

On the P2 chassis with the B5254T2 2.5L turbo engine, high exhaust temperatures accelerate thermal fatigue inside the OEM zirconia elements and heater circuits. Carbon fouling or oil blow-by coats the platinum electrodes, causing sluggish lambda feedback. When the upstream air-fuel sensor drifts or the downstream heater fails, the ECU logs P0135, P0141, or P2195 and defaults to rich open-loop fueling.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light / DTCs: Triggers heater and slow-response codes like P0130, P0135, or P0141.
• Fuel Trim Drift: Skewed upstream feedback causes lean/rich surges and P0171 faults.
• Failed Emissions: Open-loop fueling reduces MPG, overheats the converter, and fails OBD-II readiness.

The Direct-Fit Heated Zirconia Oxygen Sensor Solution

Replacing both sensors as a matched set restores factory response speed on the B5254T2 exhaust without wire splicing. Laser-welded stainless housings protect thermal-shock-resistant ceramic sensing elements against turbocharged heat cycles. Direct-fit OEM connectors plug straight into the P2 harness, while pre-coated threads speed installation. Crossing to 234-4798, this kit delivers stable wideband and narrowband signals for accurate closed-loop trim control.

What's Included

• 1 Upstream Air-Fuel Ratio Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2005-2007 Volvo V70 2.5L Turbo (2.5T)

Frequently Asked Questions & Fitment Warnings

Does this fit the P2 V70?

Yes. Fits 2005-2007 Volvo V70 models with the B5254T2 2.5L Turbo engine. Excludes 2.4L naturally aspirated engines.

Will this clear P0135 or P0141 codes?

Yes. Replacing both sensors with this 234-4798 kit resolves failed heater and response faults once codes are cleared.

Is wire splicing required for installation?

No. Direct-fit OEM connectors plug directly into the factory P2 harness; torque sensors cleanly into clean exhaust bungs.

The Volvo Precision Standard

Built for European emissions compliance, this matched sensor kit restores accurate ECU fueling and CEL-free operation under sustained turbocharger exhaust heat.