What causes fault code P013D?

• Most likely: Degraded or aged O2 sensor (Bank 2, Sensor 2) • Likely: Exhaust leak near the sensor location (venturi effect drawing in air) • Possible: Sensor contamination due to coolant or oil consumption • Possible: Damaged wiring or corrosion in the sensor connector • Rare: Outdated ECM software requiring a reflash

How do you fix fault code P013D?

STEP 1: Visually inspect the exhaust system on Bank 2 for leaks and check the sensor connector for corrosion or backed-out pins. STEP 2: Use a scan tool to monitor O2 Bank 2 Sensor 2 voltage in live data. Observe the 'Rich to Lean' transition during deceleration; voltage should drop rapidly below 0.1V. STEP 3: Test the O2 sensor heater circuit. Measure resistance across the heater wires (usually 5-20 Ohms) and verify 12V supply and ground PWM signal from ECM. STEP 4: If the sensor is found to be 'lazy', replace with a high-quality OEM sensor. Clear codes and perform a drive cycle.

Powertrain (Engine & Gearbox)Standard EOBD

P013D - O2 Sensor 2, Bank 2 - Slow Response Rich to Lean

Q: What are the symptoms of fault code P013D?

• Check Engine Light (MIL) illuminated • No noticeable driveability issues (common for downstream sensors) • Slightly increased fuel consumption • Failed emissions test

Last updated:1 February 2026

Related:O2-sensor (Bank 2 Sensor 2), SCR Catalyst, Wiring Harness, Engine Control Module (ECM)

System

Powertrain (Engine & Gearbox)

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Technical Description

P013D is triggered when the Engine Control Module (ECM) detects that the downstream Oxygen (O2) sensor on Bank 2 is responding too slowly when transitioning from a rich signal (high voltage) to a lean signal (low voltage). This typically happens during fuel cut-off events like deceleration. A slow response indicates a degraded sensor element, silicon/carbon fouling, or a failing heater circuit. This monitoring is critical for verifying the catalyst's ability to store oxygen.

Possible Causes

Degraded or aged O2 sensor (Bank 2, Sensor 2)

Exhaust leak near the sensor location (venturi effect drawing in air)

Sensor contamination due to coolant or oil consumption

Damaged wiring or corrosion in the sensor connector

Outdated ECM software requiring a reflash

Symptoms

Check Engine Light (MIL) illuminated

No noticeable driveability issues (common for downstream sensors)

Slightly increased fuel consumption

Failed emissions test

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P013D - O2 Sensor 2, Bank 2 - Slow Response Rich to Lean

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P013D - O2 Sensor 2, Bank 2 - Slow Response Rich to Lean

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