O2 Sensor Exhaust Sample Error (Bank 1 Sensor 1)
The P2414 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Exhaust Sample Error (Bank 1 Sensor 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- A scan tool shows O2 Sensor Exhaust Sample Error (Bank 1 Sensor 1) as the stored fault
- Drivability may be normal - many faults in this circuit show no symptom the driver notices
- The system may fall back to a default strategy until the fault is cleared
Probable Causes (Ranked by Likelihood)
- Wiring or connector fault at the O2 sensor exhaust sample - chafed harness, corroded pins, or a loose ground High
- Failed O2 sensor exhaust sample Medium
- A supply or reference voltage problem shared with other circuits, which usually sets companion codes too Medium
- Control module fault - rare, and only after the wiring and the component have both been ruled out Low
Common Fixes by Vehicle
What techs usually find when diagnosing P2414 on specific vehicles — tap your vehicle for the fix and the exact part:
2006-2011 Honda Civic 1.8L R18A easy DIY
Replace upstream A/F ratio sensor (Denso OEM Honda). P2414 on Civic R18 is specifically sample/flow fault -- sensor element contaminated. Don't use silicone sealant anywhere near the intake tract (silicone kills A/F sensors). Clear code, drive 30 mi, verify clear.
Labor: 30 min2008-2015 Honda Accord/CR-V 2.4L K24 easy DIY
Check exhaust manifold for cracks at the collector -- Honda K24 manifolds crack at 100k+ miles and throw P2414 as the AFR sensor sees ambient air. If manifold is OK, replace sensor with Denso OEM. Don't use universal aftermarket sensors on Honda.
Labor: 45 min2006-2012 Acura TSX/TL 2.4L/3.5L easy DIY
Replace pre-cat A/F ratio sensor (Denso Acura OEM). If code returns, pre-cat catalyst may be plugging/leaking causing airflow disturbance at the sensor -- tap the downpipe with a rubber mallet and listen for loose catalyst media.
Labor: 30 minFrequently Asked Questions
What does P2414 mean?
O2 Sensor Exhaust Sample Error (Bank 1 Sensor 1). That definition comes from SAE J2012, the standard that assigns generic OBD-II trouble code meanings.
Is P2414 the same on every vehicle?
The definition is standardized, but the exact test that sets it, the specified voltages and the physical location of the component vary by make and model. Check your vehicle's service information for those.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
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Read ALL stored codes first. Faults in this area often set several codes at once, and the cheapest cause is usually shared wiring rather than the part.
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Inspect the connector and harness at the O2 sensor exhaust sample for corrosion, backed-out pins, and chafing before testing anything electrically.
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Back-probe the circuit with the connector attached and compare the reading against the manufacturer's specification for your vehicle - generic values do not apply across makes.
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Check power, ground and reference voltage feeding the circuit before condemning the component.
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Replace the component only after the wiring tests good. Confirm the repair by clearing the code and verifying it does not return under the conditions that set it.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2010-2018 Honda Accord
- 2012-2020 Toyota Camry
- 2011-2019 Ford F-150
- 2013-2021 Chevrolet Silverado
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