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technical Q: fuel mixture, engine light vs. fuel tank pressure

Hi All,

A friend of mine recently was having trouble with his VW golf 1999, engine light would constantly intermittently go on/off, with code being "slow response" from O2 sensor.

After doing some on-line research we find that many poeple with a similar common problem on that car claim that an O2 replacement has not cured the problem. Also, one guy claimed that a few clicks of the gas cap seems to have cured his engine light problem. Strangely my friend never clicks his gas cap. After filling up last wkend he clicked it a few times, engine light went away and has been away since.

Today we noticed on his Honda (other car) the following written on the gas cap:

"Click 3 times or engine light may appear"

Q is: Is there really a corrolation between fuel mixture and gas tank pressure? Does anyone have an explanation for this?

Thanks!
Greg Mustang
Montreal - Ottawa
Canada






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