P2B8B

Intake Air O2 Sensor Heater Control Circuit/Open Bank 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–111 (est.)

Symptoms

Check Engine light comes on
Decreased fuel economy
Unstable engine operation at idle
Increased emissions
The engine can operate in emergency mode

Causes

Intake oxygen sensor malfunction
Open or short circuit in heater circuit wiring
Poor connection in heater circuit connectors
Oxygen sensor heater relay malfunction
Engine control unit (ECU) malfunction

How to Fix

Check the oxygen sensor wiring and connectors for damage or corrosion.
Check the oxygen sensor heater resistance.
Check the supply voltage to the oxygen sensor heater.
Check the oxygen sensor heater relay.
Replace the faulty intake oxygen sensor.

Related codes

P2B8A P2B8C P0135