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Ron, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 35855
Experience:  #@ years in the Automotive repair field.
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What does code c121c mean and how to repair (parts needed) a

Customer Question

What does code c121c mean and how to repair (parts needed) a Chrysler300 touring 2007
Submitted: 1 year ago.
Category: Chrysler
Expert:  Ron replied 1 year ago.

Hello and thank you for your question,

The code C121C can be set due to a leaking EGR tube gasket which is very common . There is a lip seal on the EGR tube where it seals to the plenum that will can fail and leak . The seal will fail in the plenum causing a small vacuum leak if the seal is not installed properly. Be sure to check all EGR components when these trouble code set. I would start first with checking this.