⚠️ IMPORTANT POSITION AND AFTERMARKET WARNING:
- Pre-Cat / Post-Cat Confusion: This product is the main control sensor located in the exhaust manifold, BEFORE the catalytic converter (Bank 1 Sensor 1). Its function is to adjust the engine's air/fuel mixture. If your mechanic requested a "Post-Cat (diagnostic)" sensor, this product WILL NOT fit your vehicle and the connectors are different.
- Aftermarket Sensor Disaster: BMW's electronic brain (DME) is incredibly sensitive to voltage readings. If you install a cheap BMW E46 Oxygen Sensor from China, the brain will read incorrect voltage; your vehicle will choke on a rich mixture, spit raw gasoline from the exhaust, and your check engine light will come back on in 2 days. Trust only BOSCH for your oxygen sensor!
For the technologically advanced 4-cylinder N40 and N45 engines at the heart of the BMW 3 Series, the BMW E46 Oxygen Sensor produced with German sensor giant BOSCH quality is now available! This vital part (Lambda Sensor), which decides how much gasoline and air your vehicle will consume by measuring hundreds of times per second, can become deaf over time due to years of exhaust gases, carbon deposits, and high temperatures. An old BMW E46 Oxygen Sensor that has become deaf and slow to react can cause engine shaking when cold in the mornings, idle fluctuations while waiting at traffic lights, massive fuel consumption, and that annoying yellow check engine light to illuminate. To save your vehicle from these suffocating rich/lean mixture crises, you can reset your engine's breathing with this BMW E46 Oxygen Sensor from BOSCH, which meets factory production standards. With its original socket design, this BMW E46 Oxygen Sensor fits perfectly without the need for cutting or splicing, sending the sharpest and instantaneous voltage data to your engine brain, restoring the agility and fuel economy of your N40/N45 engine in one fell swoop.
- Maximum Fuel Savings: Ends incorrect air/fuel readings, preventing raw gasoline from being wasted. A brand new BOSCH BMW E46 Oxygen Sensor pays for itself within months amid rising gasoline prices.
- Idle Stabilization: Cuts down on the up-and-down fluctuations of the tachometer (surging) and engine shaking when you stop at traffic lights.
- BOSCH Original Quality (OEM): This is the exact brand used on BMW's production line. Instantly and permanently extinguishes the check engine light on your dashboard.
- Factory Socket Compatible: Manufactured with original cable length and BMW-specific connector design; fits right into the socket without the need for soldering or additional wiring.
Technical Details
| Brand |
BOSCH (Germany / Original Equipment Supplier - OEM) |
| Product Code |
0 258 006 428 / 0258006428 |
| Product Type |
BMW E46 Oxygen Sensor (Pre-Cat / Lambda Sensor) |
| Compatibility |
BMW 3 Series E46 Chassis (FOR N40 and N45 4 Cylinder Engine Codes ONLY) |
| Original (OEM) Reference Code |
11 78 7 512 975 / 11787512975 |
Frequently Asked Questions (FAQ)
My vehicle is E46 320i (6 cylinder M52/M54), will this BMW E46 Oxygen Sensor fit my vehicle? Absolutely not! This product is only for the 4-cylinder N40 and N45 engines that came out in later years. The exhaust manifold and oxygen sensor voltage readings, as well as socket lengths, are completely different for 6-cylinder (M52 or M54) engines. Please ensure that the engine number on your registration starts with N40 or N45 before ordering.
My check engine light is on, I connected it to the computer and it shows "Oxygen Sensor Heater Circuit Failure." Will this part fix it? If the error code is for the catalytic converter before (Bank 1 Sensor 1, etc.), then yes! You are receiving this error because the resistor (heater) inside the old BMW E46 Oxygen Sensor has broken. When you install this new BOSCH sensor, the heater circuit will start working immediately, and your check engine light will not come back on after being cleared by the computer.
