O2 Oxygen Sensor Upstream Downstream for Nissan Sentra (2013-2019) 1.8L

Direct-Fit O2 Oxygen Sensor Kit for 2013-2019 Nissan Sentra (B17)

What it Does: This upstream and downstream O2 sensor kit monitors exhaust air-fuel ratios and catalyst efficiency on the 2013-2019 Nissan Sentra (B17) powered by the MRA8DE 1.8L.

The Stock Nissan Sentra O2 Sensor Failure

Over high mileage, factory oxygen sensors on the B17 chassis equipped with the MRA8DE 1.8L suffer thermal fatigue, ash fouling, and internal heater burnout. Carbon deposits coat the zirconia sensing element, causing sluggish voltage switching and skewed ECM fuel trim corrections. Damaged ceramic elements or failed heating coils trigger persistent codes like P0133, P0138, and P0141 while forcing rich open-loop fueling.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light: Triggers P0133 (slow response), P0138 (high voltage), or P0141 (heater failure).
• Rough Idle & Hesitation: Skewed sensor voltage disrupts closed-loop fuel trims under load.
• Poor MPG & Emissions Failure: Rich open-loop operation wastes fuel and fails smog tests.

The Direct-Fit Oxygen Sensor Solution

Engineered to replace OEM numbers 234-9135 and 234-4904, this matched sensor pair restores factory ECM calibration without wire splicing. Double-laser-welded stainless steel housings seal against exhaust moisture and thermal shock, while fast-acting ceramic heaters ensure rapid closed-loop light-off. Factory-length leads and weatherproof plugs connect straight to the MRA8DE harness for accurate upstream metering and downstream catalyst monitoring.

What's Included

• 1x Upstream Oxygen Sensor
• 1x Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2013-2019 Nissan Sentra 1.8L Federal Emissions (2-Sensor Package; Excludes California Emissions)

Frequently Asked Questions & Fitment Warnings

Does this fit the B17 Sentra?

Yes. Direct fit for the 2013-2019 Nissan Sentra MRA8DE 1.8L. Fits Federal emissions (2-sensor) models only; California emissions packages are excluded.

Will this clear P0133, P0138, or P0141 codes?

Yes, when sensor-related. Replacing 234-9135 and 234-4904 restores proper feedback and heater resistance; check for exhaust leaks first.

Is wire splicing required for installation?

No. Both sensors include OEM-style plugs for direct plug-and-play installation using a standard O2 socket.

The Nissan Precision Standard

Restoring accurate O2 feedback on the B17 Sentra keeps the MRA8DE 1.8L fuel-efficient and CEL-free. Matched upstream and downstream replacement ensures reliable emissions compliance.