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I don't have any of the conditions stated in the letter. Since the letter says Do not take your vehicle to the dealer unless it has the conditions mentioned, I doubt that they will just check it for free. What does that solenoid valve do ? Where is it located ?
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
As stated in the letter not to bring it in unless it has the problems, it may be a hurry up and wait which is a issue as no one will know what inconvenient moment that will be. You can call the dealer and express your concern which they may do a customer courtesy inspection or say it's nothing to worry about, it's just how good the dealership may be.
I replaced one on a 2008 Pontiac G5. Remove the plastic engine cover, disconnect the wire harness to the sensor, remove the bolt holding it down, clean any debris that might fall in, twist and pull the sensor out. Installation is the same in reverse. Might be a 15 minute job.