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DTC/P0152·Mercedes-Benz

P0152 on Mercedes-Benz: Causes, Symptoms and Fix Cost

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

P0152 on a Mercedes-Benz means the upstream oxygen sensor on bank 2 has reported a high voltage for too long, which reads as a rich mixture with too little oxygen in the exhaust. Bank 2 is the half of a V6, V8 or flat-six engine that does not contain cylinder 1 (a few inline-sixes with a split exhaust, such as BMW's M54, also have one). It is the same fault as P0132 on the other bank. The cause is either a real rich condition on that bank or a sensor or wiring fault, such as a signal wire shorted to voltage.

Typical repair cost, all makes€65 - €650

Connect any standard Bluetooth OBD2 adapter to your Mercedes-Benz and Skanyx tells you what P0152 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 P0152 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 P0152.

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. A P0152 therefore concerns the left-hand pre-cat sensor. Compare its reading with the right-hand sensor before deciding between a sensor fault and a real rich condition on that side.

What causes P0152 on a Mercedes-Benz?

Beyond the generic causes listed on the main P0152 page, these are the patterns noted for Mercedes-Benz models:

Mercedes-Benz C-Class (V6)Left-hand (bank 2) pre-cat sensor stuck at high voltage on the M272 V6
Mercedes-Benz C-Class (V6)Harness fault on the left-hand sensor circuit

How to diagnose P0152 on a Mercedes-Benz with OBD2

Follow these steps to pinpoint the root cause of P0152:

  1. Read all stored codes and freeze frame data. P0175 (System Too Rich, Bank 2) alongside P0152 supports a real rich condition on bank 2. Misfire codes on bank 2 cylinders need attention first
  2. Warm the engine and compare Bank 2 Sensor 1 with Bank 1 Sensor 1 on live data. A narrowband sensor pinned near or above 0.9 volts while the bank 1 sensor keeps switching points at bank 2
  3. Check the bank 2 fuel trims. Strongly negative trims on bank 2 only mean the engine computer is taking fuel away from that bank, which supports a real rich condition rather than a sensor fault
  4. Unplug the bank 2 sensor with the key on and watch the reading. If it still shows high voltage with the sensor disconnected, the signal wire is shorted to voltage in the harness
  5. Inspect the harness for chafing or melting where the sensor wiring runs near other circuits, and check the connector for water or corrosion
  6. If the sensor looks white, glazed or oily when removed, find the source of the contamination (coolant leak, oil burning) before fitting a new one
  7. Replace the sensor if the wiring and fuel system test good, clear the code and confirm it stays off after a drive cycle

How much does P0152 cost to fix on a Mercedes-Benz? (EUR)

Estimated repair costs for P0152 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 shorted O2 sensor wiring €5–€30 €60–€150 €65–€180 Moderate
Diagnose and fix rich condition (injector, fuel pressure) €30–€400 €80–€250 €110–€650 Professional
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 P0152 or point to related issues, on any make:

P0132P0150Mercedes-BenzP0151Mercedes-BenzP0153Mercedes-BenzP0154Mercedes-BenzP0175P0172

Looking for the full P0152 reference (all makes, full diagnosis flow, complete repair cost matrix)?

See the main P0152 guide
Skanyx · Mercedes-Benz

Diagnose P0152 on your Mercedes-Benz

Your car logged P0152. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €65-€650 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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