P015A

O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$89–167 (est.)

Symptoms

Increased fuel consumption
Unstable engine idling
Reduced engine power
Deterioration in acceleration dynamics

Causes

Oxygen sensor wear
Sensor contamination with combustion products
Exhaust system leakage
Problems with the sensor wiring harness
Malfunctions in the fuel system
Burnout or cracks in the exhaust manifold

How to Fix

Visual inspection of the sensor and its connector
Checking the integrity of the wiring harness
Diagnostics of the exhaust system for leaks
Checking the sensor operating parameters using a scanner
Replacing the oxygen sensor if necessary

Related codes

P0135 P0137 P0138 P0172