Technical guides
Everything here is written to be useful even if you decide not to buy anything. If a spacer is the wrong answer for your car, these guides say so.
Featured · Installation guide
Step-by-step guide to fitting a mini catalytic converter O₂ sensor spacer to the downstream oxygen sensor, including torque, wiring and the drive cycle.
All guides
Most catalyst codes have a cause worth ruling out before any part goes on the car. Start with the code you have.
P0420 means catalyst efficiency below threshold on Bank 1. Here is what sets the code, every real cause ranked, and how to fix it without wasting money.
Read the guide 7 min readDiagnosis · Bank 2P0430 is catalyst efficiency below threshold on Bank 2. Learn how to identify Bank 2 on your V6 or V8, diagnose the right side, and what two banks means.
Read the guide 7 min readCompatibilityHow to check whether an M18 × 1.5 O₂ sensor spacer fits your car: confirm the sensor thread, measure clearance for 58 mm, check wire length and sensor count.
Read the guide 6 min readComparisonO₂ sensor spacer vs a new catalytic converter: what each one actually does, cost and fitting time compared, and how to pick the right fix for a P0420.
Read the guide 7 min readAfter a decatCheck engine light after a decat, straight pipe or downpipe? Why the P0420 appears, what it does to fuelling, and the four ways to deal with it, ranked.
Read the guide 8 min readBuying guideHow to buy an O₂ sensor spacer in South Africa: thread size, stainless vs mild steel, catalyst element or hollow, import vs local, pricing and delivery.
Read the guideR350.00 per spacer, sensor not included. Collect free in Selby or courier nationwide, live price at checkout. Not sure yet? Send us your sensor part number and ask.