I mean, which ones never had them, as a factory-installed part? Is it by year, by model, by fuel-delivery type?

 

Mine never had one - it's an '86' carbed, 1.8L, 4WD, 5-spd. wagon.

 

I don't mean which Subes don't have them due to tinkering and retro-fitting.

There is no hard and fast rule on that. Some were equiped with feedback carbs (with O2) and some were not. The ones that don't will be non-feedback carbed models - which is the majority of 4WD's. Nearly all the 2WD's got the feedback's but most 4WD's did not. There are exceptions though as CA required all vehicles to use them and CA models were sold outside of CA. So there's no way to tell except to look under the hood.

 

GD

my 85 brat gl has one...CA model

So the rule of thumb is that a carbed non-feedback 4WD won't have the O2 sensor.

 

When did Subaru stop making non-feedback carbed models?

'87 was the last year for carbed EA82's - the non-feedback (or "49 states") models were made right up till the end. The EA81 hatch was still made till '89 in both feedback and non.

 

GD

Thanks.

Mines an 88 fi. And its right where it should be.