I own a 1992 240 with 272,000 miles.

I had not driven it for about a month or so, and when I did, the check engine light came on.

I took it to a mechanic and he reported two fault codes; a bad oxygen sensor and pinholes in an intake boot.

I can have the mechanic replace the O2 sensor for $360 in parts (for a Bosch) or I can get one myself for $200 including shipping (a Bosch) and install it myself.

Two questions.
1. If I buy the Bosch O2 sensor myself, what are the odds it's specifically the right one and the 'check engine' light will go out?
2. If I get one myself, I may not get around to installing it for a few weeks. Am I doing my car any harm by driving it with a bad O2 sensor? (car still seems to run okay).

Thanks.

If your check engine light just came on I would start with the leaky intake hose and reset the CEL. See what happens with the O2 sensor and if the CEL come on again. An O2 sensor out of range does not always mean the sensor is bad.

Tasca has the hoses for for about $45. Search for pn 1367454. You will need a 1/4" (7mm?) nut driver and a 10mm wrench. If you have not replaced your air filter in the last 50,000 miles, now is a good time.

Greg

Okay, thanks.