Macromike

I just picked up a '95 LS400 yesterday and the check engine light came on as I was driving home. Figures, huh? Anyway, I start researching how to pull the codes and find on several sites that only '96 and above have the OBD ll ports and that I can use the jumper wire on my '95. I get under the dash and low and behold, I've got a port with a cover marker OBD ll and an additional round, white plastic port marked DIAGNOSTIC. Okay, I say. I must have an OBD ll car. But when I pulled the cap from the black port, there are only a few terminals that are occupied. The build date of the car was 5/95.

Any ideas as to what I have? How do I evalute what the issue causing the check engine light is?

Thanks in advance,
Mike

DaveGS4

iTrader: (2)

By any chance did you stop and get gas on the way home? If you did, check the gas cap to make sure its on tight. If it isn't, that is the most likely cause.

spxChrome

Take it to the dealership, mine usually do diagnosis for free. Sounds like maybe the 02 sensors?

Macromike

No pit stops where taken on the way home. Good suggestion on the gas cap Dave, but it didn't seem to help.

Any ideas on how to pull the codes on a '95?

DaveGS4

iTrader: (2)

Was the cap loose when you went to tighten it (in the off chance it was the prior owner or at the last stop made for gas)? Sometimes it takes a while for the CEL to pop on, and you need to get the ECU reset (or code read) to get rid of it.

Probably beating a dead horse, but I hear from Lexus tech guys that this is about 50% of the CEL lights they see at the dealership.

SeattleGS400

iTrader: (1)

Ask VVTi, he's a moderator of the maintenance forum (and also a Lexus tech). He's been a great help for me a few times in the past.