P2B88
Intake Air O2 Sensor Circuit Bank 1
The ECM detects a generic fault on the intake air oxygen sensor signal circuit on bank 1. A drifted or sluggish lambda sensor lets the mixture run lean or rich without correction — fuel economy and emissions suffer immediately.
The ECM detects a generic fault on the intake air oxygen sensor signal circuit on bank 1. A drifted or sluggish lambda sensor lets the mixture run lean or rich without correction — fuel economy and emissions suffer immediately.
Common causes
- high
Intake air O2 sensor failed
One of the most commonly reported causes for this code — check this first.
Typical part cost: $170-880
- medium
Wiring or connector fault
A plausible cause — test and verify before replacing parts.
Typical part cost: $170-880
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2B88 mean?
P2B88 means "Intake Air O2 Sensor Circuit Bank 1". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2B88?
intake air o2 sensor failed; wiring or connector fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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