What does slow response mean for an O2 sensor?

The engine computer constantly moves the mixture slightly rich and slightly lean, and the upstream sensor has to follow each change quickly. As a sensor ages, the time it takes to switch gets longer. When it gets too long, the computer can no longer trust the sensor for precise fuel control and sets P0153.

Is P0153 the same as P0133?

It is the same fault on the other bank. P0133 is a slow upstream sensor on bank 1, the bank with cylinder 1, and P0153 is a slow upstream sensor on bank 2. Engines with two banks can set either code, or both at once if both sensors are old.

Can a slow O2 sensor damage the catalytic converter?

Not quickly, but it can over time. Imprecise fuel control means the mixture drifts further rich and lean than it should, and extended rich running overheats the converter. Replacing a sensor costs far less than a converter, so do not ignore the code for months.

Can I clean an O2 sensor instead of replacing it?

Cleaning rarely restores a slow sensor, because the ageing happens inside the ceramic element, not just on the surface. If the sensor is coated in oil or coolant residue, cleaning it does not fix the leak that caused it. Replacement is the reliable repair.

Which sensor is Bank 2 Sensor 1?

It is the upstream oxygen sensor, the one before the catalytic converter, on the half of the engine that does not contain cylinder 1. Most V6, V8 and flat-six (boxer) engines have two cylinder banks, each with its own upstream sensor. A few inline-sixes with two exhaust manifolds, such as BMW's M54, also split into bank 1 (cylinders 1-3) and bank 2 (cylinders 4-6). Which physical side is bank 2 differs between makers, so check the service information for your engine before you order a part.

P0153: O2 Sensor Circuit Slow Response (Bank 2, Sensor 1)

Quick Answer

Safe to drive (short-term)

P0153 means the upstream oxygen sensor on bank 2 is switching between rich and lean too slowly for the engine computer's test. 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 P0133 on the other bank. The usual cause is an aged or contaminated sensor, though an exhaust leak or a mixture problem on that bank can cause it too.

Severity: Moderate · Emissions
Estimated repair cost: From €45 to €560+, varies by vehicle

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What does P0153 mean?

P0153 is a emissions-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0153 and illuminates the check engine light.

Where it is on the car

Engine
Oxygen sensor before the converter (sensor 1)
Catalytic converter
Oxygen sensor after the converter (sensor 2, or 3 on some cars)
Silencer and tailpipe

This code is for bank 2. V6, V8 and flat engines have two cylinder banks, each with its own converter and sensors; bank 2 is the side without cylinder 1.

What are the symptoms of P0153?

If your vehicle has triggered P0153, you may notice one or more of these symptoms:

Check engine light on
Gradually worse fuel economy
Slightly rough or hunting idle
Hesitation under light throttle
Failed emissions test
Often no obvious drivability change

What causes P0153?

Here are the most common causes of P0153:

Aged upstream O2 sensor on bank 2 with a slow switching time
: high
Sensor contaminated by oil burning, coolant or fuel additives
: medium
Exhaust leak ahead of the bank 2 sensor diluting the gas sample
: medium
Vacuum leak or misfire on bank 2 upsetting the mixture the sensor sees
: low
Damaged wiring or connector causing an intermittent signal
: low

Is it safe to drive with P0153?

Generally yes, for short-term driving. Safe to drive in the short term. A slow sensor makes the fuel control on bank 2 less precise, so fuel economy and emissions get worse, and the car can be rejected at an emissions test, depending on the country's rules. Plan the repair within a few weeks.

How do you diagnose P0153?

Follow these steps to pinpoint the root cause of P0153:

Read all stored codes. Misfire, lean or rich codes on bank 2 must be fixed first, because they change what the sensor sees
Warm the engine and graph Bank 2 Sensor 1 and Bank 1 Sensor 1 side by side. A healthy narrowband sensor swings between roughly 0.2 and 0.8 volts, and each switch takes a fraction of a second. If the bank 2 trace rounds off and lags the bank 1 trace, the bank 2 sensor is slow. A generic OBD2 reader samples too slowly to time the switching precisely, so treat the comparison as a rough guide; a lab scope or the manufacturer's software shows it properly
Snap the throttle and watch the response. A good sensor goes rich almost instantly; a slow one takes noticeably longer than the bank 1 sensor. On engines with wideband (air-fuel ratio) sensors, watch how quickly each bank's lambda value moves away from 1.00 and back instead of looking for switching
Check for exhaust leaks ahead of the bank 2 sensor, including the manifold gasket and any flange joint
Check whether the engine burns oil or loses coolant. Either can coat the sensor tip and slow it down, and a new sensor will go the same way if the cause is not fixed
If the rest checks out, replace the bank 2 upstream sensor with a direct-fit part, clear the code and complete a drive cycle

How much does P0153 cost to fix?

Repair costs for P0153 vary depending on the root cause and your vehicle. Here are typical estimates:

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 exhaust leak ahead of the bank 2 sensor	€15–€80	€50–€200	€65–€280	Moderate
Repair O2 sensor wiring or connector	€5–€25	€40–€120	€45–€145	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.

Full repair guides

Oxygen Sensor Replacement Cost

P0153 on specific vehicles

P0153 behaves differently depending on your vehicle. Select your car below for model-specific causes and known issues:

P0153 on Mercedes-Benz

Mercedes-Benz C-Class (V6)

See Mercedes-Benz-specific causes & cost

P0153 on BMW

BMW 5 Series (545i/540i/550i)

See BMW-specific causes & cost

P0153 on Porsche

Porsche Boxster (986)

See Porsche-specific causes & cost

These codes are often seen alongside P0153 or indicate related issues:

Common questions about P0153

What does slow response mean for an O2 sensor?: The engine computer constantly moves the mixture slightly rich and slightly lean, and the upstream sensor has to follow each change quickly. As a sensor ages, the time it takes to switch gets longer. When it gets too long, the computer can no longer trust the sensor for precise fuel control and sets P0153.
Is P0153 the same as P0133?: It is the same fault on the other bank. P0133 is a slow upstream sensor on bank 1, the bank with cylinder 1, and P0153 is a slow upstream sensor on bank 2. Engines with two banks can set either code, or both at once if both sensors are old.
Can a slow O2 sensor damage the catalytic converter?: Not quickly, but it can over time. Imprecise fuel control means the mixture drifts further rich and lean than it should, and extended rich running overheats the converter. Replacing a sensor costs far less than a converter, so do not ignore the code for months.
Can I clean an O2 sensor instead of replacing it?: Cleaning rarely restores a slow sensor, because the ageing happens inside the ceramic element, not just on the surface. If the sensor is coated in oil or coolant residue, cleaning it does not fix the leak that caused it. Replacement is the reliable repair.
Which sensor is Bank 2 Sensor 1?: It is the upstream oxygen sensor, the one before the catalytic converter, on the half of the engine that does not contain cylinder 1. Most V6, V8 and flat-six (boxer) engines have two cylinder banks, each with its own upstream sensor. A few inline-sixes with two exhaust manifolds, such as BMW's M54, also split into bank 1 (cylinders 1-3) and bank 2 (cylinders 4-6). Which physical side is bank 2 differs between makers, so check the service information for your engine before you order a part.

Read our detailed guides

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