ZN6/ZC6Seller listing
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View listing at Toyotapartsdeal; opens in a new tabFRS/BRZ/86 · Buyer's guide
First-Generation FR-S/BRZ/86 Air-Fuel and Oxygen Sensors versus Catalyst Diagnosis
First-generation Scion FR-S 2013-2016, Subaru BRZ 2013-2020 and Toyota 86 2017-2020; upstream air-fuel-ratio and downstream oxygen sensor positions remain distinct
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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ZN6/ZC6Seller listing
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View listing at Frsport; opens in a new tabWhat you need to know
First-generation FA20 exhaust sensing only. Resolve Bank 1 Sensor 1 upstream A/F versus Bank 1 Sensor 2 downstream O2. Diagnose exhaust leaks, wiring, fuel control, ECM calibration and catalyst efficiency before replacement.
OEM numbers
Toyota upstream A/F sensor SU003-00425 and downstream oxygen sensor SU003-00428. Checked Subaru upstream path 22641AA640. Denso 234-9136 is a checked upstream replacement path.Supersession
No upstream/downstream interchange and no assertion that a sensor automatically repairs P0420. Exact badge/VIN catalog and connector/position must agree.
Fitment
First-generation FA20 exhaust sensing only. Resolve Bank 1 Sensor 1 upstream A/F versus Bank 1 Sensor 2 downstream O2. Diagnose exhaust leaks, wiring, fuel control, ECM calibration and catalyst efficiency before replacement.
Aftermarket options
Checked OEM and exact Denso upstream paths. Universal splice-in sensors are not promoted.
Before you buy
Upstream A/F and downstream O2 sensors are not interchangeable. A P0420 code does not prove the sensor is bad; inspect leaks, calibration, fuel control and catalyst condition first.
Research and fitment sources
Supersede reviewed 7 unique research sources for this guide. 5 also appear above as a seller or official action and are not repeated here; 2 additional citations follow.
Research last verified .