Lude Generation

Hi got a 2000 f20a4 prelude which I am going to put a h22a8 engine in I know where all the wiring and vacuum pipes go but I can not find the plug for the o2 sensor I know it should be on the loom at the rear but nothing there if anyone can help or know what colour wires are for it thanks

Welcome to LG!!

It should be grey square cluster connector with 4 pins. It should be near the end of the H22a8 engine loom that connects to the internal loom ie one of the first connectors, it will be next to the knock sensor wiring.

f20a4 have only one oxygen sensor, before cat

It is the same for all UK H22 preludes.

Only JDM cars have a pre-CAT O2 sensor and a heat sensor in the CAT.

my h22 have 2 o2 sensors same year as f20a4, 1997

Merlin is right - there is only one 02 sensor this normally is bolted into the 2 to1 section of the downpipe just ahead of the cat - on JDM H22's there is an extra sensor in the body of the CAT - this is to warn of the Cat overheating and has its own warning light up on the dash cluster

Thanks I have another look tonight it's not a jdm so should be there let u know cheers all

should be just to the right hand side and slightly further towards the front from where the oil filter sits - hopefully its there but has been caught up/snagged on something higher up

Hmm had a good look can't see it engine is in my shed with loom on it Everything plug on the engine already except for a green 2 pin plug for power steering and a 3 pin plug for vss on gearbox there is no other wires loose and no sign off anything ripped off on the loom I have two big grey plugs capped off but they have like 8ish wires in them and seem to be that way from factory as there clip on properly. Anyone know what colour wires there meant to be and which pins on the main plugs so I can trace back? Any suggestions as really doing my head thankyou all

IanPreludeuk wrote:Hmm had a good look can't see it engine is in my shed with loom on it Everything plug on the engine already except for a green 2 pin plug for power steering and a 3 pin plug for vss on gearbox there is no other wires loose and no sign off anything ripped off on the loom I have two big grey plugs capped off but they have like 8ish wires in them and seem to be that way from factory as there clip on properly. Anyone know what colour wires there meant to be and which pins on the main plugs so I can trace back? Any suggestions as really doing my head thankyou all

Basically you should look for a connector that can plug such little thing into:


Wires should be green, white black and grey (about the last one I could be wrong though)