O2 Oxygen Sensor Upstream Downstream for Chrysler 300 (2014-2017) 3.6L

Direct-Fit O2 Oxygen Sensor Kit for 2014-2017 Chrysler 300 (LD)

What it Does: This matched four-piece oxygen sensor kit restores closed-loop air-fuel ratio monitoring and catalytic efficiency checks on 2014-2017 Chrysler 300 (LD) ERB 3.6L Pentastar V6 engines.

The Stock Chrysler 300 Sensor Failure

Factory oxygen sensors on the LD platform behind the ERB 3.6L Pentastar V6 fail from thermal cycling, heater circuit burnout, and zirconia element fouling caused by fuel additives or oil vapor. Once the ceramic tip fractures or platinum electrodes glaze, voltage switching slows dramatically. This sluggish response skews PCM fuel trims, triggering P0133, P0135, P0155, and false P0420 catalyst efficiency fault codes.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Stores heater or slow-response codes like P0130, P0135, P0155, or lean trim faults P0171/P0174.
• Sluggish Switching & Hesitation: Delayed millivolt transitions cause rough idling, throttle stumble, and rich exhaust odor.
• Emissions Failure: Open-loop fueling reduces MPG and blocks OBD-II readiness monitors.

The Direct-Fit Heated Zirconia Sensor Solution

Engineered to replace OEM numbers including 234-4030 and 234-4274, this matched four-sensor set covers upstream bank 1/bank 2 air-fuel control and downstream catalyst monitoring. Each unit features a fast-response planar zirconia sensing element inside a laser-welded stainless steel housing to resist exhaust heat soak. Factory-style connectors and pre-coated threads ensure exact electrical impedance and direct plug-and-play installation without wire splicing.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2014-2017 Chrysler 300 (3.6L V6)

Frequently Asked Questions & Fitment Warnings

Does this fit the LD 300?

Yes. This is a direct fit for the 2014-2017 Chrysler 300 equipped with the ERB 3.6L Pentastar V6 engine. Excludes 5.7L HEMI and 6.4L SRT V8 models; confirm engine before ordering.

Will this clear P0135/P0155 and P0420 codes?

Yes, when caused by worn sensors. Replacing all four sensors restores heater resistance and switching waveforms to clear P0135/P0155, though a damaged catalyst still triggers P0420.

Is wire splicing or special prep required?

No splicing is required. Each sensor includes OEM-style connectors; chase corroded exhaust bung threads, torque to spec, and clear stored PCM codes.

The Chrysler Precision Standard

Accurate closed-loop feedback keeps the ERB 3.6L Pentastar V6 operating at peak stoichiometric efficiency. Replacing all four sensors as a matched set ensures balanced fuel trims and emissions compliance.