2003 Volkswagen Jetta TDI Q&A

2003 Volkswagen Jetta TDI Question: the jetta is automatic and the check engine light is on constantly

My mechanic says its the transmission and it will have to be replaced. the car runs fine. the only problem is that the check engine light s on, what can I do to fix it. when the check engine light is cancelled by code it comes back on in the next half hour. -
Answer 1
get second opinion and get free diagnostic at Aamco transmission -
Answer 2
What is the code/codes number? -