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SKU:
NLT1I00114
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Downstream Oxygen Sensor for 2010-2015 Toyota Prius | 234-4400
$29.99
In Stock
$29.99
Sale price
$29.99
Regular price
This aftermarket downstream oxygen sensor replaces Denso-style 234-4400 on compatible 2010-2015 Toyota Prius 1.8L exhaust systems.
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Toyota Prius 1.8L 2010
- Toyota Prius 1.8L 2011
- Toyota Prius 1.8L 2012
- Toyota Prius 1.8L 2013
- Toyota Prius 1.8L 2014
- Toyota Prius 1.8L 2015
- Toyota Prius Plug-In 2012-2015 when 234-4400 is specified
- Toyota Prius v applications using 234-4400
Product Overview
A heater-circuit fault, slow downstream response, damaged wiring, or a sensor contaminated by oil or coolant can trigger an emissions warning. This sensor monitors exhaust after the catalytic converter; it does not perform the same fuel-control role as the upstream air/fuel sensor. Codes such as P0138, P0139, or P0141 still require wiring and exhaust diagnosis before replacement.
The result is a focused repair path for the owner who has already narrowed the problem to this component. Confirm downstream location, connector, wire length, emissions configuration, engine, and 234-4400 interchange.
Key Features & Performance
- Downstream/post-catalyst oxygen sensing
- Vehicle-style connector for compatible Prius applications
- Heated sensor design
- Replacement for damaged or slow original sensor
Replaces Part Numbers
- 234-4400
- 2344400
Common Uses
- P0141 heater-circuit diagnosis confirms sensor failure
- Rear sensor wiring is damaged by heat or impact
- Downstream signal is slow after exhaust faults are repaired
- Replacing a seized or contaminated sensor during exhaust service
Technical Specifications
- Product Type: Oxygen Sensor
- Position: Downstream/Rear/Post-Catalyst
- Engine: 1.8L Hybrid
- Reference: 234-4400
- Replacement Type: Aftermarket
Installation & Fitment
- Let the exhaust cool and disable the hybrid system as specified
- Inspect wiring, grounds, fuses, and connector before replacement
- Use an oxygen-sensor socket and avoid twisting the harness
- Apply anti-seize only if the sensor manufacturer directs it
- Clear faults and complete the appropriate drive cycle
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown. Confirm downstream location, connector, wire length, emissions configuration, engine, and 234-4400 interchange.
Frequently Asked Questions
Q: Is this the upstream air/fuel sensor? A: No. It is listed for the downstream position after the catalyst.
Q: Will it fix P0420? A: Not automatically. P0420 requires catalyst, exhaust-leak, sensor, and engine diagnosis.
Q: Can oil burning damage an oxygen sensor? A: Yes. Correct the source of contamination or the replacement may fail again.
Part Summary
keywords: Toyota Prius downstream oxygen sensor, 234-4400 O2 sensor fit, Prius P0141 rear sensor, 2010-2015 Prius post catalyst sensor, aftermarket Prius oxygen sensor
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.