Parts for your 1987 Suzuki Jimny-Oxygen sensor

1987 Suzuki Jimny (SJ413/Sierra) oxygen sensor: is it used?

Based on factory and aftermarket technical references, an oxygen (lambda) sensor is not fitted to the 1987 Suzuki Jimny/SJ413 sold in Australia and New Zealand. The Suzuki SJ413/Sierra factory service manual for carburetted G13A models shows a conventional carburettor fuel system with no ECU and no lambda feedback in the wiring diagrams. Likewise, locally used workshop references such as the Gregory’s Suzuki Sierra 1982–1998 manual describe emissions gear (charcoal canister, EGR/air systems on some variants) but do not list an oxygen sensor for the 1987 carb models. Suzuki’s parts catalogues for SJ413/Sierra also only list an oxygen sensor on later EFI variants (and certain overseas “feedback carb” setups), not on 1987 AU/NZ builds.

Why it’s not there is simple: the 1987 Jimny/Sierra in this market runs a mechanically metered carburettor, so there’s no engine control unit to read a lambda signal or trim fuelling. At the time, local emissions requirements didn’t mandate closed-loop control on these small carburetted 4x4s, so the exhaust system wasn’t provisioned with a sensor bung or wiring, and the under‑bonnet loom has no O2 circuit.

• Carburetted G13A engine with no ECU = no closed-loop control
• Factory wiring diagrams and service procedures show no O2 sensor
• Parts listings only note an oxygen sensor on later EFI/overseas feedback-carb models

What owners should look after instead: keep the carburettor tuned, ignition timing set correctly, and all vacuum hoses tight and uncracked. A solid base tune (mixture, idle speed, float height), fresh plugs and leads, and checking for intake or exhaust leaks will do more for drivability and economy than chasing a sensor the vehicle was never built with. If a previous owner has retrofitted EFI or a later exhaust manifold with a bung, an oxygen sensor may be present—have a peek at the exhaust manifold/downpipe for a small threaded probe and trace any nearby single- or three/four‑wire connector near the firewall.

For most 1987 AU/NZ Jimny/Sierra examples, there’s no oxygen sensor to service or replace—just stick to regular servicing and proper carb and ignition tune, and it’ll keep chugging along nicely on and off the track.

FAQs

Does a 1987 Suzuki Jimny/Sierra have an oxygen sensor?
Typically no, not on AU/NZ carburetted models. Factory manuals and parts catalogues show no O2 sensor provision for 1987 carb versions. Some overseas variants or retrofits may differ, so a quick visual under the bonnet and at the exhaust is the best check.

Where would an oxygen sensor be if mine has one?
If fitted (aftermarket EFI or certain non‑local spec setups), it’ll sit threaded into the exhaust manifold or the front section of the downpipe before the catalytic converter, with a lead running to the engine bay loom/ECU. The bung is usually M18×1.5.

What should be serviced instead of an oxygen sensor on a carburetted 1987 Jimny?
Carb tune (mixture, idle, float height), ignition timing, plugs, leads, distributor condition, vacuum hoses, and checking for intake/exhaust leaks. These have the biggest impact on fuel economy, cold starts, and throttle response on a carb model.