Keep the engine's fuel control dialed in with the DENSO Air / Fuel Ratio Sensor 234-5138, a wide-band, heated sensor that measures the oxygen content in the exhaust and reports a precise air-fuel ratio to the ECU so it can trim fuel delivery. It's a direct-fit replacement cataloged in the upstream (pre-catalyst), upstream-left position for a wide range of 2006-2016 BMW models, including the 128I, 135I, 323I, 328I, 335I, 528I, 550I, 650I, X3, X5 and Z4 with the L6-2.5L, L6-3.0L, L6-3.2L and V8-4.8L engines — see the Buyer's Guide tab for the full list of 29 applications.
- Laser-welded stainless housing & PTFE filter: resists corrosion and blocks contaminants under harsh engine conditions.
- Dual-layer element protection: shields the ceramic element for fast, reliable response times.
- Wide-band, heated 5-wire design: male connector, 0.711 in thread diameter and a 46.85 in wiring harness.
- Country of origin: Japan.
If a failed air/fuel ratio sensor is the cause of fuel-trim codes, rough running or poor fuel economy, this replaces it; diagnose the underlying cause before installing. Most listed applications use one sensor; the 2006-2008 BMW Z4 [L6-3.2L] uses two. Sold individually.
Interchange: 213-3936 · 2133936 · 11787540166 · 11787540167 · 11787557223 · 11787558073 · 11787558081 · 11787558087 · 11787589138 · 15168 · 17091 · 17094 · 17099 · 17102 · 17124 · 17230 · ES11081 · 24333 · 24345 · 250-25046 · 25025046 · 250-25047 · 25025047 · 350-35002 · 35035002 · 350-35058 · 35035058. Manufacturer part number 234-5138.
This part cross-references / interchanges with the following part numbers:
213-3936, 11787540166, 11787540167, 11787557223, 11787558073, 11787558081, 11787558087, 11787589138, 15168, 17091, 17094, 17099, 17102, 17124, 17230, ES11081, 24333, 24345, 250-25046, 250-25047, 350-35002, 350-35058
