2000 xterra- bad knock sensor
This is my first post- I was reading some posts about people having to replace/diagnose knock sensor problems and have one of my own. I'm not very familiar with stuff under the hood but I'm always happy to help with electrical issues inside the car. I used to install car electronics professionally and still know many wire diagrams by heart so I'm happy to help in that area.
Right now my car is at a mechanic's garage, one that I don't know well enough to trust, but I think they know what they're doing because they replaced my heater core a few weeks ago (at a hefty cost of $600) and my car seems to be put together properly. Anyway, I had two codes come up and one was the knock sensor and I need an inspection. They called me and told me that it needed a few things, one being a new knock sensor but after reading some other posts I'm uncertain about a) that it isn't the MAF or something else and b) that it's worth repairing at 4/5hrs labor ($65/hr) in addition to the 2hrs they've already charged me to diagnose.
I thought it was pretty standard at places like Midas to charge a flat fee, like $50 to diagnose, but these guys are saying that something like this it's as long as it takes to figure out what all my car needs. Basically, they told me everything it needs to pass inspection so after I give the green light to fix it (and drive it to get rid of the service engine light) they'll put a sticker on it.
I am going to my hometown in about 2/3 weeks where I have a friend who is a mechanic who I trust and I know will give me the best deal, but my question is how do I make sure it needs replaced, and how much labor should that really be? I can get a factory part online for about $150 and that's $35 less than the mechanic can get it from the dealer for. Is it likely that the mechanics would know for sure it's the knock sensor that needs replaced? That's what they've said but after reading a lot of different threads here I'm second guessing how sure they are about it needing replaced.
Also, I'm thinking these guys are ripping me off but I can't be certain. It seems like the fact that they said 'bring it in and we'll see what we need to do' and they looked at it officially from 2pm-4pm and called me with what it needs and are charging me for that 2hrs labor on top of whatever work they're going to do, makes me not want them to touch it. Especially since I wasn't expecting a $130 diagnosis fee. Thoughts?
Is it harmful to go a few weeks until I make the 8hr drive home to my mechanic before fixing the knock sensor if that's what it is?
Last edited by Adamtd101; Feb 20th, 2006 at 05:50 PM.