Need your guys' thoughts on my car problem:
I added a bottle of Redline SI-1 to my Ford Focus (Zetec 2.0 liter) about a month ago. I haven't driven a lot of miles on the car since then, but have gone through maybe 1-1&1/2 tanks of gas. Last week, my "CHECK ENGINE" light came on for three days, then went out. I took the car to the shop, and they were able to pull the stored code, which reportedly showed something about a lean condition. They said that since the light went out, not to worry about it at the time. Well, I picked the car up last night, and by the time I got home, the light was back on. Brought the car back to the shop today, they scanned it again, and this time got different fault codes. These codes were still related to rich/lean conditions, but the tech told me they were different from the first code he pulled. He checked for vacuum leaks right then, but couldn't find any. At this time, he's not sure what is causing the problems, stating it may or may not be a bad O2 sensor. He went ahead and cleared the fault codes to see if the light comes back, matching either the first or second set of codes.
The only thing I've done recently to the Focus is add the SI-1. Do you think it may have somehow screwed with the engine? Could it be a bad tank of gas? Up until now, I've never had a problem with the car. In the meantime, I'm just stuck waiting for the light to come back on, hoping I'm not doing any damage to the engine. I haven't noticed any drop/change in performance or mpg's, but the tech said that he thought the accelerator felt a little sluggish.
I added a bottle of Redline SI-1 to my Ford Focus (Zetec 2.0 liter) about a month ago. I haven't driven a lot of miles on the car since then, but have gone through maybe 1-1&1/2 tanks of gas. Last week, my "CHECK ENGINE" light came on for three days, then went out. I took the car to the shop, and they were able to pull the stored code, which reportedly showed something about a lean condition. They said that since the light went out, not to worry about it at the time. Well, I picked the car up last night, and by the time I got home, the light was back on. Brought the car back to the shop today, they scanned it again, and this time got different fault codes. These codes were still related to rich/lean conditions, but the tech told me they were different from the first code he pulled. He checked for vacuum leaks right then, but couldn't find any. At this time, he's not sure what is causing the problems, stating it may or may not be a bad O2 sensor. He went ahead and cleared the fault codes to see if the light comes back, matching either the first or second set of codes.
The only thing I've done recently to the Focus is add the SI-1. Do you think it may have somehow screwed with the engine? Could it be a bad tank of gas? Up until now, I've never had a problem with the car. In the meantime, I'm just stuck waiting for the light to come back on, hoping I'm not doing any damage to the engine. I haven't noticed any drop/change in performance or mpg's, but the tech said that he thought the accelerator felt a little sluggish.