O2 Oxygen Sensor Upstream Downstream for Honda HR-V (2016-2021) 1.8L

Direct-Fit Upstream & Downstream O2 Sensor Kit for 2016-2021 Honda HR-V (RU5/RU6)

What it Does: Monitors exhaust oxygen levels on the 2016-2021 Honda HR-V RU5/RU6 (R18Z9 1.8L) to regulate fuel trim and verify catalyst efficiency.

The Stock Honda HR-V Sensor Failure

On the RU5/RU6 HR-V equipped with the R18Z9 1.8L engine, factory oxygen sensors endure severe thermal cycling, moisture shock, and carbon fouling. As the internal zirconia element ages or the integrated heater circuit burns out, voltage switching speed drops sharply. This sluggish response skews PCM closed-loop fueling trims, degrades fuel economy, causes drivability issues, and triggers persistent P0135, P0141, or P0171 fault codes.

Common Symptoms of a Failing OEM O2 Sensor

• Check Engine Light / DTCs: Triggers P0135 (upstream heater), P0141 (downstream heater), or P0133 slow-response codes.
• Erratic Fuel Trim: Skewed lambda feedback causes rough idle, hesitation, and P0171 lean faults.
• Failed Emissions & MPG Drop: Incomplete OBD-II readiness monitors and elevated fuel consumption.

The Direct-Fit Zirconia O2 Sensor Solution

This matched upstream and downstream kit replaces both sensors simultaneously to restore accurate closed-loop fuel control and catalyst monitoring on the R18Z9 1.8L. Each direct-fit unit features a fast-light-off zirconia ceramic element, laser-welded stainless housing, and corrosion-resistant protective shield against thermal shock and moisture. Factory-length harnesses and pre-terminated OEM connectors match part 234-4979 for plug-and-play installation without cutting or wire splicing.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 2016-2021 Honda HR-V (1.8L US-Market — 2-Sensor System: 1 Upstream, 1 Downstream; confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the RU5/RU6 HR-V?

Yes. Direct fit for the 2016-2021 Honda HR-V with the R18Z9 1.8L engine. US-market 1.8L only; confirm engine before ordering.

Will this clear P0135, P0141, or P0420 codes?

Yes, for sensor faults. Replaces faulty heaters (P0135/P0141), though persistent P0420 indicates catalyst failure.

Are wiring modifications required for installation?

No. Plug-and-play OEM connectors require zero splicing; clean bung threads and torque to spec.

The Honda Precision Standard

Replacing both sensors as a matched set restores factory R18Z9 1.8L stoichiometric precision and CEL-free operation. Expect consistent closed-loop fuel economy, clean emissions readiness, and crisp throttle response.