I am having massive problems with my 07 Cobalt. I keep getting "Service Traction" error as well as reduced engine power. I had it loaded on a car hauler and brought it to a mechanic. The
mechanic told me that it is the crankshaft position trigger and the cost will be $1600 or more, due to the parts location. Which is located inside the engine block. I replaced the crankshaft position sensor yesterday but it didn't help any.
Any suggestions?

 

Need some more info:
1) Model type (LT/LS/SS)
2) Mileage
3) Automatic or Manual transmission
4) When did this start happening
5) CEL Codes (most important)

 

By crankshaft position trigger I assume the mechanic is referring to the reluctor wheel which is attached to the crankshaft. It's simply a round plate with square notches cut into the perimeter. Did the end of your sensor look like it had come into contact with anything when you removed it? It's unusual that something would happen to damage your reluctor wheel under normal use. The crank relearn procedure may help if your reluctor actually isn't damaged. Like Prof stated above, please share your engine codes.

There are relatively cheap borescopes available online that you can use wirelessly with your smartphone. Alternatively, find someone who has a bore scope so you can remove the sensor and inspect the reluctor wheel as someone slowly rotates the engine. I'd think you should be able to see if it is bent or something happened to deform the notches. It's more work but you should also be able to inspect the wheel if you remove your oil pan. I'm pretty sure the whole crankshaft has to be removed to replace it but maybe if something is slightly bent or clogged up you can massage it back to place from underneath.