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Read the code(s), Neo, as described in the thread. There's no reason to guess why the ECU is turning the light on.

Replaced it with a new one and no CEL any more. Also cleared the codes and am left with only one: 21 temp sensor. Does this mean the fans will run all the time? They don't seem to so maybe it's an intermittent connection. Also the temp guage behaves normally, but perhaps that runs off a seperate sensor?

THanks to all.
A>

A bad temperature sensor can cause problems starting (especially when cold), rough idles, and generally incorrect fuel mixtures.

The gauge operates from a separate sender unit that's mounted right next to the ECU's temperature sensor.

When the ECU is operating in "bad temp sensor" mode it will run the fans all the time too though, so maybe you do have an intermittent problem. It could be a wiring problem rather than a problem with the sensor itself.

So the CEL doesn't actually come on, but code 21 is stored in memory?

The sensor is pretty easy to replace and only lists for $25. It's part number 22630AA041. If you do decide to try replacing yours, I have a new unused sensor and gasket that you could have cheaper than a dealer would sell it for; PM me if you want it.

Ha! By George I think you've got it! Yes - CEL is not on at all, but....

Cold starting is as though there's not choke: revs and dies, revs and dies, pendulum swinging. Have to keep my foot a little in the throttle for 30s until it stabilizes. Probably the temp sensor?!

PMed you to buy yours. Thanks.

A.

Yep, that sounds like the temp sensor indeed.

When I ook my car to the mechanic, he said it was the purge thing as well. He said it would cost me $200 to replace. I smiled and walked out, warm in the knowledge that I will be fixing that one myself.

It's a PITA, but you can definitely do it yourself for ~$60 if you buy it new. That's what I did.

-Brian

Not really that bad. Use a socket and extension to carefully hold the bolt in the new solenoid as you feed it below the intake. Took me about 20 mins.

Oh, on a turbo it's a PITA.

A.

Yes, I assume it's much easier on an NA car. On the Turbo's it's a royal PITA. You may need to get someone with small hands to get in there and attach vacuum hoses and whatnot.

-Brian

Is there a way to bypass/jump the purge solenoid to fake the ecu. Sure beats $90, if somebody has a trick please fill me in.

There was a post a while back were ciper thought he might have figured a way to do it, but he hadn't actually done it. He just had the plans to do it, I think.

I still haven't changed mine. It has been many months. hehe

It's just such a pain to get to on a turbo; that and I haven't made time. I have the new one sitting on my desk in front of my keyboard.

georryan wrote: I still haven't changed mine. It has been many months. hehe
I have the new one sitting on my desk in front of my keyboard.

your looking at it now, aren't you? I'll give you a penny for everytime you've looked at it in the last 4 months..

If you just want to get rid of the purge control valve CEL, you could just replace it with a resistor. A 200-ohm 1-watt resistor ought to work, I think. Wire it right where the solenoid goes, or between the ECU's purge control solenoid pin (cut the wire going into the rest of the harness) and ignition-switched +12v.

Hi - im new to subarus and this forum but it looked like a good place to get some help!

I have a 1994 JDM legacy GT 2L twin turbo wagon (auto).

Im gettin the engine check light coming on, and the corresponding error code is "66" - now ive looked on the net for what this error code is but cant find anything.... can anyone here help me out?

thanks!

AL

While you may get some good responses, this forum is for first gen. Legacys. Your 1994 is a BG (2nd gen.) IIRC on all continents aside from North America. I'm not really sure where to direct you, but maybe the Ultimate Subaru Message Board?

-Brian

you'd probably get better responses on www.rslibertyclub.org than USMB There's quite a few people with second gens there

Thanks for the tips - i managed to sort the problme - it was 2 vac leaks in the solenoid bank - something to do with the twin turbo system - anyhow all fixed now