What causes fault code P0153?

• Most likely: Fouled or defective Oxygen Sensor (Bank 2, Sensor 1) • Likely: Exhaust leak upstream of or near the sensor • Possible: Wiring issues or high resistance in the sensor connector • Possible: Intake air leaks or faulty Mass Air Flow (MAF) sensor • Rare: Improper fuel pressure or engine mechanical issues (oil/coolant burning)

How do you fix fault code P0153?

STEP 1: Inspect for exhaust leaks. Check the manifold and pipes on Bank 2 for cracks or leaks that could introduce 'fresh' air. STEP 2: Inspect wiring and connectors for burns or corrosion. STEP 3: Use a scan tool to monitor Live Data. With the engine at operating temperature and 2500 RPM, the O2 voltage should oscillate rapidly between 0.1V and 0.9V. If the switching is slow, the sensor is likely aged. STEP 4: Check for vacuum leaks or a dirty MAF sensor that might cause sluggish response. STEP 5: Replace Oxygen Sensor (Bank 2, Sensor 1) and clear codes.

Powertrain (Engine & Gearbox)Standard EOBD

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

Q: What are the symptoms of fault code P0153?

• Check Engine Light (MIL) illuminated • Decreased fuel economy • Rough idling or hesitation during acceleration • Increased tailpipe emissions • Smell of unburnt fuel from the exhaust

Last updated:1 February 2026

Related:Syrgassensor (O2 Sensor), Mass Air Flow Sensor (MAF), Exhaust Manifold, Engine Control Unit (ECU/PCM)

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0100

Mass or Volume Air Flow A Circuit Malfunction

P0101

Mass or Volume Air Flow Circuit Range/Performance Problem

P0102

Mass Air Flow (MAF) Circuit Low Input

P0103

Mass or Volume Air Flow Circuit High Input

Technical Description

P0153 is an OBD-II generic code indicating that the Powertrain Control Model (PCM) has monitored the Bank 2, Sensor 1 oxygen sensor for a specific period and determined that the response rate (switching frequency/voltage transition time) is slower than the calibrated limit. The sensor is responsible for adjusting the air-fuel ratio by oscillating between lean and rich signals. A 'lazy' sensor cannot keep up with rapid changes in exhaust chemistry, leading to poor fuel trim management.

Possible Causes

Fouled or defective Oxygen Sensor (Bank 2, Sensor 1)

Exhaust leak upstream of or near the sensor

Wiring issues or high resistance in the sensor connector

Intake air leaks or faulty Mass Air Flow (MAF) sensor

Improper fuel pressure or engine mechanical issues (oil/coolant burning)

Symptoms

Check Engine Light (MIL) illuminated

Decreased fuel economy

Rough idling or hesitation during acceleration

Increased tailpipe emissions

Smell of unburnt fuel from the exhaust

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

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

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Technical Description

Possible Causes

Symptoms

Recommended Solution

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Mechanic's Tip

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other fault codes?