O2 Oxygen Sensor Upstream Downstream for Lincoln MKZ (2013-2020) 2.0L Hybrid

Direct-Fit Oxygen Sensor Kit for 2013-2020 Lincoln MKZ (CD533)

What it Does: This upstream and downstream oxygen sensor kit restores closed-loop air-fuel metering and catalyst monitoring on the 2013-2020 Lincoln MKZ CD533 2.0L Atkinson-Cycle I4 Hybrid.

The Stock Lincoln MKZ Sensor Failure

On the CD533 equipped with the 2.0L Atkinson-Cycle I4 hybrid powertrain, frequent engine start-stop thermal cycling accelerates sensor wear. Exhaust soot, moisture condensation, and thermal shock fracture the zirconia element or burn out the internal heater circuit. This degrades upstream lambda response and downstream switching accuracy, triggering P0135, P0141, or P0420 fault codes and forcing open-loop fuel enrichment.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Stored codes like P0135, P0141, or P0133 from heater burnout or sluggish response.
• Reduced MPG: Inaccurate upstream feedback forces rich open-loop fueling.
• Emissions Failure: Faulty downstream readings prevent catalyst readiness monitor completion.

The Direct-Fit Oxygen Sensor Solution

Replacing both sensors as a matched pair restores synchronized air-fuel metering and catalyst monitoring on the 2.0L Atkinson-Cycle I4. Each sensor uses a laser-welded stainless steel housing, fast-lightoff heater, and zirconia ceramic element built to match OEM 234-5068 and 234-4578 electrical resistance specs. Factory-length harnesses and weather-sealed OEM connectors ensure reliable PCM communication without cutting, splicing, or exhaust bung modifications.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2013-2020 Lincoln MKZ 2.0L Hybrid (ELECTRIC/GAS) — Uses 2 sensors
• Does not fit 2.0L EcoBoost MKZ models
• Ford C-Max 2.0L Hybrid (separate row sharing listing; confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the CD533 MKZ?

Yes. Fits 2013-2020 Lincoln MKZ CD533 2.0L Atkinson-Cycle I4 Hybrid (ELECTRIC/GAS) models. Does not fit 2.0L EcoBoost MKZ models.

Will this clear P0135, P0141, or P0420 codes?

Yes, for sensor faults. Replacing both sensors resolves P0135 and P0141 heater/response codes; persistent P0420 indicates catalytic converter wear.

Are factory connectors included for installation?

Yes. Direct-fit OEM connectors and pre-threaded housings install into factory bungs without splicing.

The Lincoln Precision Standard

Engineered for hybrid emissions precision, these direct-fit sensors maintain exact air-fuel stoichiometry during start-stop transitions. Restore readiness monitors and CEL-free operation.