I have read through most of the threads on the O2 sensor. But have not seen the answer to my question.

When I start my car either hot or cold, everything is normal. Then about 5 minutes after I started it, the Check Engine light comes on. Is this the O2 sensor? I do not sense any difference in idle or anything when the light comes on?

Reason I ask, is that I just talked to my MB Indy Shop and asked about this, and he said that they start with cleaning the O2 sensor with Injection Cleaner, and if that does not stop the light from coming on, they then work the injection system. It seems strange that he did not even mention changing the O2 Sensor.

Thanks in advance.

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

Until it reaches operating temp, the o2 sensor is basically "null" and out of the CIS's computer's loop as far as being an operational factor. What symptoms, other than the engine light are you getting? Lousy mileage, running rich, sooty exhaust might suggest a faulty sensor.

I do not think that it is running rich, at least I do not see any signs of it on the tailpipe, any other signs?

As for mileage, I guess it has gotton a little worse but I have 205 width tires on the car at the moment. (had to rainy season here in central america - about to put new 195 width on this week since rainy season has finished) Also, depends on my driving style that particular day if I ahve pass buses and so forh, lots of hills (mountains) where I live at 5,380 feet above sea level.

I see that others have placed a Bosch sensor for the ford in the car. Is this that easy? All I do is cut the wires and splice together? Where do I splice? Under the floor mat of the passenger side? The O2 sensor here is a little pricy and I just did the timing chain and tensioner and tomorrow getting new motor mounts installed (also pricy) and need to get those new tires.

thanks for your help on this.

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

oh and I forgot to ask again... is it really possible to clean it with injection cleaner or something else? does that usually resolve the problem?

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)

Just to let others out there know what my problem was.

Last night upon arriving home after work I decided to take a look at the wires connected to the O2 sensor (underneath the matt of the passenger side of the car) to see if "I" could actually adapt the Ford Sensor that I have read about on other threads within this forum.

What I found was the the "Black" wire not not connected to the female receiver under teh matt of the paasenger side of the vhicle. Obviously, either during one of my recent services someone pulled the wires from underneath the car causing this to get unplugged, or during a detailing that the detailer pulled the connector and caused it to become unplugged.

Long story short, reconnected the "black" wire, Check Engine Light turned off.

I guess I went about this the wrong way and did not look for the simplest solution first!

Thanks though to all who have posted on this topic throughout the forum because of you I found this problem and saved myself some coin!

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)