2001 jetta 2.0 codes and hard starting

2001 jetta just tunedup 9/30 had codes P0606 (ECM/PCM Processor ?)P0171 Bank 1 too lean P0178 Coolant temp circut The shop reset the codes and the check engine lite came on again this lite comes and goes all the time in the past week or so the car will act at times where it won't start cranks ok just won't start -- after a few trys it starts and runs fine with no starting problems for a few days miliage is 64000 can experts tell me if this is going to be a big expence to repair:crying:

replace the engine coolant temp sensor ($10.00) and also check the fuel pressure regulator vacuum hose and see if its cracked or falling off.

replaced the temp control sensor-all the vaccum hoses are ok--what is this code P0606 ECM/PCM processor and the code P0171 bank 1 too lean ??