2005 S60 2.5T Check Engine Light Code P0402 - One Time Appearance?
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Joined: Apr 2014
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From: New Jersey
2005 S60 2.5T Check Engine Light Code P0402 - One Time Appearance?
Have my used S60 for a month now, and decided to pour a bottle of Techron Fuel System Cleaner in with a tank of Mid-Grade last week.
This afternoon, started the car and went to the supermarket. When I came out, and restarted the car, the Check Engine Light came on,
My code scanner indicated a small leak in the emissions control system P0402. I went to the dealer, and he mentioned that maybe there was a problem with the gas cap. Otherwise, I will have to come back for a full diagnostic. He said it could be so many things.
I replaced the gas cap with a new one by Stant I bought from Pep Boys, erased the code from the computer, and filled up again but this time with BP Premium, NOT Mid-Grade.
I drove the car almost 100 miles today after doing this, and the CEL never came on again(and I stopped and restarted the car several times doing other errands.)
I am thinking that maybe the Techron dislodged something while cleaning or maybe it was just a faulty gas cap. The cap was the original from 9 years ago. Or maybe, it was just poor quality gas, that mid-grade. I experienced this problem once with a Ford and a CEL. After I threw in cleaner, and refueled with Premium, the CEL went out, and never came back on. I do not know if the same theory applies to 2.5T Turbos.
Forgot to mention that I noticed no major performance issues while driving at the beginning when the CEL came on. I did feel as if the engine was running a little rough at first but that seemed to disappear after I changed the cap and filled with Premium.
What do you think? The cap, the gas, or maybe the Turbo Engine is more sensitive to fuel engine cleaners like Techron?
When I bought the car a month ago, it had 46k miles, so I guess the previous owner did not use it much? Maybe there was some carbon buildup?
This afternoon, started the car and went to the supermarket. When I came out, and restarted the car, the Check Engine Light came on,
My code scanner indicated a small leak in the emissions control system P0402. I went to the dealer, and he mentioned that maybe there was a problem with the gas cap. Otherwise, I will have to come back for a full diagnostic. He said it could be so many things.
I replaced the gas cap with a new one by Stant I bought from Pep Boys, erased the code from the computer, and filled up again but this time with BP Premium, NOT Mid-Grade.
I drove the car almost 100 miles today after doing this, and the CEL never came on again(and I stopped and restarted the car several times doing other errands.)
I am thinking that maybe the Techron dislodged something while cleaning or maybe it was just a faulty gas cap. The cap was the original from 9 years ago. Or maybe, it was just poor quality gas, that mid-grade. I experienced this problem once with a Ford and a CEL. After I threw in cleaner, and refueled with Premium, the CEL went out, and never came back on. I do not know if the same theory applies to 2.5T Turbos.
Forgot to mention that I noticed no major performance issues while driving at the beginning when the CEL came on. I did feel as if the engine was running a little rough at first but that seemed to disappear after I changed the cap and filled with Premium.
What do you think? The cap, the gas, or maybe the Turbo Engine is more sensitive to fuel engine cleaners like Techron?
When I bought the car a month ago, it had 46k miles, so I guess the previous owner did not use it much? Maybe there was some carbon buildup?
Senior Member
Joined: Nov 2013
Posts: 417
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Yes, the CEL can show up 'one time only' when the engine doesn't burn the mixture properly. As soon as things get back to normal, the CEL should went out by itself.
Not sure about fuel cleaners but usually it shouldn't cause a problem. As far as I know, the fuel grade won't cause a CEL, unless the car already has some ignition issue.
Not sure about fuel cleaners but usually it shouldn't cause a problem. As far as I know, the fuel grade won't cause a CEL, unless the car already has some ignition issue.
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