Check Engine light

  • Thread starter Thread starter Alfie O'Megan
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Alfie O'Megan

2000 V40 60K Miles

Check engine stayed on. Replaced Oxygen Sensor and replaced battery.
Check Eingine light stayed off for a few weeks and now comes back on,
intermittently. The car runs very well and I cannot detect any apparent
problems. Detached battery cables for about 4 hours, but after hooking
up, the light came back on. Also had a tuneup when the Oxygen Sensor was
installed. Getting good gas mileage and does not use any oil between
changes.

Any help or ideas appreciated!
 
Alfie said:
2000 V40 60K Miles

Check engine stayed on. Replaced Oxygen Sensor and replaced battery.
Check Eingine light stayed off for a few weeks and now comes back on,
intermittently. The car runs very well and I cannot detect any apparent
problems. Detached battery cables for about 4 hours, but after hooking
up, the light came back on. Also had a tuneup when the Oxygen Sensor was
installed. Getting good gas mileage and does not use any oil between
changes.

Any help or ideas appreciated!
Click to expand...

The Check Engine light came on in my 2000 S40. I went to the dealer's service, where they
checked the computer and said it was because the gas tank cap wasn't put on tightly after
I got gas. In a few days, the light came back on. They reset it again, after finding
nothing wrong. The next day, the light was on again, though I hadn't touched the gas cap.
The service manager got involved (I insisted on it by now), and suggested trying a new
gas cap. He took one out of stock, and remarked that the design was changed. It's a
couple of months since the new cap was put on, with no Check Engine lit. I guess Volvo
changed the design for a reason and isn't being open about it, not wanting to pay for
replacing a lot of caps.
 
Thanks, Marvin.

I've been very careful about securing my gas cap but the light still
comes on. I'll purchase a new one from the dealer, and see if it helps.
 
Gas cap $30.00......result negative. Check engine ilight still on.
 
Alfie said:
Thanks, Marvin.

I've been very careful about securing my gas cap but the light still
comes on. I'll purchase a new one from the dealer, and see if it helps.
Click to expand...

Your check engine light is trying to tell you something. Any place with
an OBD-II reader will be able to tell you what.

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
Alfie O'Megan said:
Gas cap $30.00......result negative. Check engine ilight still on.
Click to expand...
Be aware a certain number of warm-up cycles are needed to automatically
reset the Check Engine light, typically four warm-ups or so.

Some auto parts chain stores will read the OBD II codes responsible for the
light free of charge. Those codes are vital to determining what is wrong.

Mike
 
Michael said:
Be aware a certain number of warm-up cycles are needed to automatically
reset the Check Engine light, typically four warm-ups or so.

Some auto parts chain stores will read the OBD II codes responsible for the
light free of charge. Those codes are vital to determining what is wrong.

Mike
Click to expand...
Mine would not reset automatically. It had to be turned off.
 
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