ISR Performance OE Replacement SR20DET O2 Sensor - FAT

The ISR Performance OE replacement SR20DET O2 sensor in the fat plug configuration is the correct oxygen sensor for S13 blacktop and S14 SR20DET engines. Most imported SR motors arrive with an exhausted sensor, and a lazy O2 signal throws off closed-loop fueling, which costs you gas mileage and makes the engine run richer than it needs to.

Why replace it

The oxygen sensor is the ECU's only feedback on how the engine is actually burning fuel. When it slows down or reads flat, the ECU falls back on default trims. A fresh sensor brings idle quality and cruise fueling back to where Nissan intended.

• OE replacement SR20DET oxygen sensor
• 3 wire connector, fat style plug
• Direct replacement, no splicing required when matched to the correct harness

Which SR20DET uses the fat plug

S13 blacktop SR20DET engines use the fat type 3 wire plug, and S14 SR20DET engines also use the fat type sensor. If you have an S13 redtop, you need the skinny plug version instead.

Before you order

Harnesses get swapped and mixed on used engines, so pull your current sensor and compare the connector before choosing. The fat and skinny plugs look similar at a glance but will not interchange without rewiring.

All ISR Performance products are designed for off-road use only.