O2 Oxygen Sensor Upstream Downstream for Mazda 6 (2011-2013) 3.7L
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Direct-Fit Oxygen Sensor Replacement Kit for 2011-2013 Mazda 6 (GH)
What it Does: The 4-piece oxygen sensor kit monitors pre- and post-catalytic exhaust gases on the 2011-2013 Mazda 6 3.7L to restore closed-loop fuel trims, optimize the air-fuel ratio, and eliminate diagnostic trouble codes.
The Stock Mazda 6 Sensor Degradation
Over extended operating cycles, factory oxygen sensors on the 3.7L MZI V6 succumb to exhaust particulate buildup, silica contamination, and thermal fatigue. As internal zirconia elements deteriorate, response times lag significantly, forcing the engine control module into prolonged rich or lean conditions. In the GH chassis, this sluggish sensor activity commonly triggers persistent P0130–P0161 circuit codes or false catalyst efficiency alerts (P0420/P0430), leading to unburned hydrocarbons, increased fuel consumption, rough idle transitions, and fouled spark plugs.
The Engineering Solution
This comprehensive 4-sensor package replaces both upstream air-fuel ratio sensors and downstream heated oxygen sensors simultaneously, preventing mixed-signal imbalances across cylinder banks. Constructed with laser-welded 304 stainless steel housings, double-layered protective shields, and robust internal ceramic elements, these units withstand intense exhaust heat soak without signal drift. Factory-pinned, pre-terminated wiring harnesses and weatherproof connector bodies match OE specifications precisely, enabling direct plug-and-play installation without cutting, splicing, or pinning.
What's Included
- 2x Upstream Oxygen Sensors
- 2x Downstream Oxygen Sensors
Technical Specifications
| Fitment | 2011-2013 Mazda 6 |
|---|---|
| Engine / Chassis | 3.7L MZI V6 / GH |
| Stock Output | 272 hp / 269 lb-ft |
| Replaces OEM Part # | 234-4489, 234-5038, BR3Z-9G444-A, BR3Z9G444A, BE5Z9G444D, BH6Z9G444A, BL3Z9F472A, BL3Z9G472A, CA38188G1, CA3918861, CA4118861, CK4Z9G444D, DY1178, OS5578, ZZDL18861, 234-4490, 9E5Z9F472D, 2344489 |
Compatibility
- 2011 Mazda 6 s (3.7L V6 DOHC)
- 2012 Mazda 6 s (3.7L V6 DOHC)
- 2013 Mazda 6 s (3.7L V6 DOHC)
Frequently Asked Questions & Fitment Warnings
Does this fit the GH 6?
Yes, this is a direct fit for the 2011-2013 Mazda 6 equipped with the 3.7L MZI V6 engine. This kit does not fit 2.5L 4-cylinder models.
Are the harnesses pre-wired with factory connectors?
Yes, each sensor features factory-correct plugs and exact harness lengths, eliminating the need for wire cutting or splicing.
The Mazda Performance Standard
Restoring factory stoichiometric precision maintains the responsive power delivery and linear acceleration expected from your V6 sports sedan while protecting downstream catalytic converters from fuel washing.
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