Hi all,

I have a '90 240 wagon that I've owned for a year. I bought it cheap, and though it didn't run great, it was good enough to drive to work. It is occasionally a bit hard to start, idle is low and a bit rough, but on the highway it performs well.

Now, it has quit running, and I'm suspecting the fuel pump. But that's another story.

In going over the car w/Bentley in hand, I discovered that there is no oxygen sensor present! The hole is plugged with a bolt. However, the car returns no error codes. Does the lack of codes suggest that my ECU is bad?

 

O2 sensors go bad all the time on older OBDI and OBDII systems without setting off a code. Most the time, the only way you can tell is the car runs like crap. I had a Cressida once that had two bad O2 sensors, bum wires, cracked distributor cap and an arching rotor and no code came up then either.