P0420 / P0430 Fix for Toyota FJ Cruiser

Running a high-flow exhaust on your FJ Cruiser (1GR-FE 4.0 V6), or just dealing with aging factory cats, and now you've got P0420 or P0430? It's a common CEL on the FJ, and this is the part that clears it.

The Fix: 90° O2 Sensor Spacer

The Brockett Built 90° O2 sensor spacer threads into the downstream (rear) O2 bung and moves the sensor out of the direct exhaust stream, so the ECU stops flagging catalyst efficiency. CNC-machined for the M18x1.5 thread, a direct fit for Toyota downstream sensors.

• The 1GR-FE is a dual-bank V6, so you may need two spacers. P0420 only means one; P0420 plus P0430 means two. Grab the 2-Pack.
• About a 10-minute install per side. Clear codes and drive a readiness cycle.
• Downstream (rear) sensors only, never the upstream sensor.

Fitment

Toyota FJ Cruiser (2007-2014), 4.0L 1GR-FE V6. Uses the standard M18x1.5 downstream O2 thread. The same spacer fits the 1GR-FE 4Runner, Tacoma, and 4.0 Land Cruiser Prado.

FAQ

Will it affect performance or fuel economy?
No. The downstream sensor only monitors cat efficiency, it doesn't touch fuel trim, so your tune and mileage are unaffected.

Legal note: designed for modified/off-road use. Check local emissions laws.

Get the 90° O2 Sensor Spacer: $42 single / $84 2-Pack →

Machined by Brockett Built in central Illinois. Ships same or next business day. 30-day fitment guarantee.