850 check engine light on

fonzie · Post by **fonzie** » 09 Jan 2005, 17:38

my wagon died today and I could not start it. seemed like a gas proble. I finally got it started. Check engine light stays on and it has a rough idle. any suggestions?

Post by **matthew1** » 09 Jan 2005, 18:37

Mass airflow sensor or vacuum line would be my guesses.

Tsquared · Post by **Tsquared** » 09 Jan 2005, 18:40

Get the engine codes pulled to see what the problem is....

Sorry to sound like a smart a$$ but that is the best way to begin the troubleshooting process. You can get many auto parts houses to pull your codes for free (they will give you the code but will not clear it in many cases).

Once you have the codes it will point you direction of the problem components.

fonzie · Post by **fonzie** » 09 Jan 2005, 19:44

dont want to sound stupid but what are the codes??

Guest · Post by **Guest** » 09 Jan 2005, 20:46

Basically it works like this-

Service Light - A light that comes on at specific intervals

Check Engine Light - Comes on after being triggered by a sensor

The check engine light then stores a code by what is called OBDII. Spelled out it means On Board Diagnostics. So when you take your car in somewhere and say my check engine light is on the corresponding auto place plugs in a little reader that puts out a code. That code then corresponds to something and you can troubleshoot from there.

For example these are codes for an 850:
http://au.geocities.com/ozbrick850/comp ... volvo.html

Additionally, check the homepage of this site and look under the advice section for a bit more explanation on OBDII and what not.

Hope this helped some

fonzie · Post by **fonzie** » 10 Jan 2005, 04:39

thanks, wish me luck!

fonzie · Post by **fonzie** » 12 Jan 2005, 18:19

Thanks guys! It was a spark plug problem.