If you're checking into electrical faults then a multimeter from Harbor Freight Tools ($5 on sale) or a Craftsman on sale at Sears ($11) should work fine. You probably dont' need a test light now if you have a multimeter, and some test lights shouldn't be used on electronic ignition systems because of current draw anyway (can damage transistors):
Craftsman Multimeter, Digital, with 8 Functions and 20 Ranges
$11 on sale Sears Item# 03482141000 | Model# 82141
http://www.sears.com/shc/s/p_10153_12605_03482141000P?prdNo=1
Or HFT $5 on sale:
http://www.harborfreight.com/7-function-digital-multimeter-90899.html
If you are going to be doing your own oil changes and transmission fluid drains/refills, then a metric socket set and hex bit sockets (for transmission and differential drain bolts) at HFT, 6 Piece 3/8" Drive Metric Hex Bit Socket Set. Or just get a single 10mm one $5.49 at Sears (Sears Item# 00942679000 , I think the $8.99 HFT set is a better deal myself, but you likely won't need the others):
http://www.harborfreight.com/6-piece-38-drive-metric-hex-bit-socket-set-67891.html
plus an oil filter wrench especially good for the smaller I4 filter:
http://www.harborfreight.com/2-inch-to-4-1-4-quarter-inch-oil-filter-wrench-36778.html
A mechanic's tool set like:
HFT $32, but you'll need an additional 1/2" metric socket set for heavier work and maybe a few others later:
http://www.harborfreight.com/64-piece-14-38-and-12-socket-set-67995.html
http://www.harborfreight.com/10-piece-high-visibility-12-drive-metric-socket-set-67916.html
Or the Sears 118 pc set on sale $54-60 has most sockets you'll need, but has only 1/4" and 3/8" ratchets, not the 1/2"-drive ratchet. IMO this is the better deal and you can get a HFT 1/2" ratchet later if needed:
http://www.sears.com/shc/s/p_10153_12605_00934118000P?prdNo=24
1/2" HFT ratchet, $12 on sale:
http://www.harborfreight.com/1-2-half-inch-drive-heavy-duty-quick-release-ratchet-40582.html
1/2" set of extension bars:
http://www.harborfreight.com/catalogsearch/result?q=1/2"+extension
Or build them separately starting out with a 3/8" set and then a 1/2" set with a short extension bar and a 14" breaker bar, but these are only metric:
http://www.harborfreight.com/20-piece-high-visibility-38-drive-metric-socket-set-67999.html
http://www.harborfreight.com/16-piece-high-visibility-12-drive-metric-socket-set-67988.html
For tire rotation a 18" long (or 25" long for more leverage but clumsy) 1/2"-drive breaker bar:
http://www.harborfreight.com/12-drive-18-breaker-bar-67932.html
http://www.harborfreight.com/12-drive-25-breaker-bar-67933.html
I would also pick up a set of torque wrenches when the sale prices are like $12-19 each or so.
http://www.harborfreight.com/1-2-half-inch-drive-click-stop-torque-wrench-239.html
http://www.harborfreight.com/3-8-eighth-inch-drive-click-stop-torque-wrench-807.html
http://www.harborfreight.com/1-4-quarter-inch-drive-click-stop-torque-wrench-2696.html
Plus other basic hand tools like screwdrivers, pliers, etc.
Craftsman Multimeter, Digital, with 8 Functions and 20 Ranges
$11 on sale Sears Item# 03482141000 | Model# 82141
http://www.sears.com/shc/s/p_10153_12605_03482141000P?prdNo=1
Or HFT $5 on sale:
http://www.harborfreight.com/7-function-digital-multimeter-90899.html
If you are going to be doing your own oil changes and transmission fluid drains/refills, then a metric socket set and hex bit sockets (for transmission and differential drain bolts) at HFT, 6 Piece 3/8" Drive Metric Hex Bit Socket Set. Or just get a single 10mm one $5.49 at Sears (Sears Item# 00942679000 , I think the $8.99 HFT set is a better deal myself, but you likely won't need the others):
http://www.harborfreight.com/6-piece-38-drive-metric-hex-bit-socket-set-67891.html
plus an oil filter wrench especially good for the smaller I4 filter:
http://www.harborfreight.com/2-inch-to-4-1-4-quarter-inch-oil-filter-wrench-36778.html
A mechanic's tool set like:
HFT $32, but you'll need an additional 1/2" metric socket set for heavier work and maybe a few others later:
http://www.harborfreight.com/64-piece-14-38-and-12-socket-set-67995.html
http://www.harborfreight.com/10-piece-high-visibility-12-drive-metric-socket-set-67916.html
Or the Sears 118 pc set on sale $54-60 has most sockets you'll need, but has only 1/4" and 3/8" ratchets, not the 1/2"-drive ratchet. IMO this is the better deal and you can get a HFT 1/2" ratchet later if needed:
http://www.sears.com/shc/s/p_10153_12605_00934118000P?prdNo=24
1/2" HFT ratchet, $12 on sale:
http://www.harborfreight.com/1-2-half-inch-drive-heavy-duty-quick-release-ratchet-40582.html
1/2" set of extension bars:
http://www.harborfreight.com/catalogsearch/result?q=1/2"+extension
Or build them separately starting out with a 3/8" set and then a 1/2" set with a short extension bar and a 14" breaker bar, but these are only metric:
http://www.harborfreight.com/20-piece-high-visibility-38-drive-metric-socket-set-67999.html
http://www.harborfreight.com/16-piece-high-visibility-12-drive-metric-socket-set-67988.html
For tire rotation a 18" long (or 25" long for more leverage but clumsy) 1/2"-drive breaker bar:
http://www.harborfreight.com/12-drive-18-breaker-bar-67932.html
http://www.harborfreight.com/12-drive-25-breaker-bar-67933.html
I would also pick up a set of torque wrenches when the sale prices are like $12-19 each or so.
http://www.harborfreight.com/1-2-half-inch-drive-click-stop-torque-wrench-239.html
http://www.harborfreight.com/3-8-eighth-inch-drive-click-stop-torque-wrench-807.html
http://www.harborfreight.com/1-4-quarter-inch-drive-click-stop-torque-wrench-2696.html
Plus other basic hand tools like screwdrivers, pliers, etc.
