P0420 / P0430 Fix for Lexus GX470

GX470 owners know the drill: headers or Y-pipe go on, or the factory cats hit 150k, and the P0420 / P0430 light shows up like clockwork. The 4.7 2UZ-FE runs perfectly — the ECU just doesn't like what the rear O2 sensors are seeing.

The Fix: 90° O2 Sensor Spacer

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

• Two banks on the 2UZ — you need two spacers. The 2-Pack V8 Kit covers both sides.
• 10-minute install per side. Downstream sensors only — never upstream.
• 90° offset keeps the sensor tucked up for ground clearance — GX overlanders take note.

We Know This Truck

The GX470 is our shop specialty — same 304 stainless, TIG-welded work as the spacer:

• 2UZ-FE Mid-Length Headers
• GX470 Y-Pipe
• Modular Catback System

FAQ

GX460 too?
Yes — the 1UR-FE uses the same M18x1.5 downstream threads. Two banks, two spacers. We make a GX460 Y-Pipe as well.

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

Get the 90° O2 Sensor Spacer — $42 single / $84 V8 2-Pack →

TIG-welded and machined by Brockett Built in central Illinois. Ships same or next business day. 30-day fitment guarantee.