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DTC/P0150·Mercedes-Benz

P0150 on Mercedes-Benz: Causes, Symptoms and Fix Cost

Quick Answer
Moderate SeveritySafe to drive (short-term)Mercedes-Benz

P0150 on a Mercedes-Benz means the engine computer is getting an implausible or out-of-range signal from the upstream oxygen sensor on bank 2, the sensor before the catalytic converter on the half of the engine that does not contain cylinder 1. Bank 2 exists on most V6, V8 and flat-six engines and on a few inline-sixes whose exhaust is split into two halves, such as BMW's M54. It is the same fault as P0130, just on the other side of the engine, and the cause is usually the sensor itself or its wiring and plug.

Typical repair cost, all makes€45 - €560

Connect any standard Bluetooth OBD2 adapter to your Mercedes-Benz and Skanyx tells you what P0150 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.

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What does P0150 mean on a Mercedes-Benz?

The Quick Answer above is the generic definition. What follows is the model-specific detail for the Mercedes-Benz models that log P0150.

Mercedes-Benz C-Class (V6)

2005-2011

On Mercedes V6 and V8 engines, including the M272 V6 in the C 230, C 280, C 300 and C 350, bank 1 is the right-hand side of the engine and bank 2 the left-hand side, viewed in the direction of travel, whichever side the steering wheel is on. Each bank has its own upstream sensor ahead of its catalytic converter. P0150 therefore points at the left-hand pre-cat sensor and its wiring, which is the driver's side on a left-hand-drive car and the passenger side on a UK right-hand-drive car.

What causes P0150 on a Mercedes-Benz?

Beyond the generic causes listed on the main P0150 page, these are the patterns noted for Mercedes-Benz models:

Mercedes-Benz C-Class (V6)Failed left-hand (bank 2) pre-cat sensor on the M272 V6
Mercedes-Benz C-Class (V6)Corroded or damaged plug on the left-hand pre-cat sensor

How to diagnose P0150 on a Mercedes-Benz with OBD2

Follow these steps to pinpoint the root cause of P0150:

  1. Read all stored codes and the freeze frame. Note whether bank 1 sensor codes (P0130-P0135) or other bank 2 codes (P0151-P0155, P0174) are stored too. Faults on both banks at once point to something they share, such as a fuse, a ground or a fuel or air problem, rather than one bad sensor
  2. Find out which physical side is bank 2 on your engine. It is the bank without cylinder 1, but makers place cylinder 1 on different sides, so check the service information instead of guessing
  3. Warm the engine fully and watch the Bank 2 Sensor 1 and Bank 1 Sensor 1 readings side by side on a scan tool. A healthy narrowband sensor switches between about 0.1 and 0.9 volts several times a second at 2000 rpm. If bank 1 switches and bank 2 is flat, missing or pinned, the problem is on the bank 2 side. Wideband sensors show lambda or current instead of a switching voltage, so compare bank 2 against bank 1
  4. Inspect the bank 2 sensor connector and wiring along its full run for corrosion, melted insulation, pushed-back pins and chafing against the exhaust or heat shields
  5. With the key on and engine off, back-probe the harness plug: confirm battery voltage on the heater feed, a good ground, and continuity of the signal wire back to the engine computer using the wiring diagram
  6. Check for exhaust leaks ahead of the sensor. A ticking noise on a cold start that fades as the engine warms often means a leaking manifold gasket or a cracked manifold
  7. If the wiring and exhaust are sound, fit a direct-fit sensor with the correct plug, clear the code and complete a drive cycle to confirm it stays off

How much does P0150 cost to fix on a Mercedes-Benz? (EUR)

Estimated repair costs for P0150 in EUR, compiled across makes. Expect Mercedes-Benz parts and labour towards the upper end of each range.

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Replace upstream O2 sensor (Bank 2, Sensor 1) €40–€180 €50–€140 €90–€320 Moderate
Repair O2 sensor wiring or connector €5–€25 €40–€120 €45–€145 Moderate
Repair exhaust leak ahead of the bank 2 sensor €15–€80 €50–€200 €65–€280 Moderate
Replace upstream O2 sensors on both banks at once €80–€360 €80–€200 €160–€560 Moderate

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

These codes are often seen alongside P0150 or point to related issues, on any make:

P0130P0151Mercedes-BenzP0152Mercedes-BenzP0153Mercedes-BenzP0154Mercedes-BenzP0155Mercedes-BenzP0174Mercedes-BenzP0430Mercedes-Benz

Looking for the full P0150 reference (all makes, full diagnosis flow, complete repair cost matrix)?

See the main P0150 guide
Skanyx · Mercedes-Benz

Diagnose P0150 on your Mercedes-Benz

Your car logged P0150. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €45-€560 repair range so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.

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