Car Information:
Chevy Impala
Year: 2003
Engine Size: 3.4 Liter
Trans: Automatic

Issue / Question:
Car had a problem last week no power. Took to transmission guy and found catalytic converter plugged, had it replaced and got a PO420 code. Three days later saying catalyst efficiency below threshold bank 1, cleared and replaced both up and downstream 02 sensors, getting the same code back this morning. What do I do next?

We need to use our TECH 2 GM scan tool to monitor the catalytic converter to see if it is reaching minimum target temp. If not this will continue to keep resetting, a vacuum leak can also cause this.

Let us know when you want to bring it in, 407-629-2661

For professional auto repair and auto services in Orlando you can call our shop today at 407-629-2661.

Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
 • (407) 298-7447