Postby Hawairish » Sun Sep 06, 2015 8:29 am
Out of curiosity, are you actually experiencing any performance degradation on the truck? I mean, a failed MAF and cam sensor usually produce a truck that doesn't start, or runs very poorly. I would've expected some mention about that. And if your shop specifically told you "left upper cam sensor"...there is no "upper" sensor, just left and right.
The codes from your ECU won't always automatically suggest a particular failed part, especially a sensor. They usually indicate a failure is detected at the sensor. It could be the sensor, but it could also be something else.
If your shop didn't provide you any codes, take it to any auto parts store and they'll pull codes for free. You can then use the Factory Service Manual (Google "Pathfinder FSM NICO") to diagnose/troubleshoot them. When facing a $1200 repair bill, it's a no-brainer to spend 30 minutes and $0 doing some homework.
If you're getting any MAF issues and you know you've got a torn intake boot, you must fix that first. Any leaks on the intake side can screw with the MAF. My truck won't even start if the intake is disconnected past the MAF. There are two ducts, they run $40 each from CourtesyParts.com...code "nis10" should cover S&H. Otherwise, you could probably find this easily at a local pick-n-pull for a few bucks.
The other items seem pretty trivial to me, if you've got the aptitude and DIY spirit. You can find replacement leather seat covers, and replacing them would be the perfect excuse to pulling the seat to check the motor, switch, and connections...all of which can be tested with a multimeter. If rust is starting to spread, there are some easy steps to patch up and slow its progress (POR-15).
If it's still road-worthy, those expenses just seem like the costs of maintaining a decade-plus year-old vehicle.
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As mentioned, only you can justify keeping or selling. Don't confuse an AWD system with a 4WD...Subaru produces a fine vehicle (had 08 WRX), but it's apples to oranges. It's a great mileage improvement, no doubt, very well suited for road trips (drove mine cross-country, twice, in one year), but it can only do a small fraction of what a Pathfinder can do off-road.