P019A

O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Deterioration in engine dynamics
Increased fuel consumption
Unstable idling
Check Engine Light Illuminates

Causes

Dirty or worn oxygen sensor
Problems in the sensor circuit (break, contact corrosion)
Leaks in the exhaust system
Malfunction of the catalytic converter
Incorrect operation of the fuel system

How to Fix

Check the condition of the oxygen sensor for contamination or damage.
Check the integrity of the wiring harness and contacts
Eliminate leaks in the exhaust system
Check catalytic converter
Replace sensor if necessary

Related codes

P0135 P0136 P0141