I spent several hundreds dollars to pass emissions last month. I was
receiving eCU codes P0401 and P0420, which were both resolved after
the shop replaced my Catalyst Converter and O2 sensor, but now the
"Check Engine" light is back with the following codes:
0171 and 1456
I knew something was wrong since the car had troubles accelerating
after being at a complete stop. It will jerk and sometimes jump.
I've never seen these two codes before having the shop work on my
car. Could this be just a mere coincidence or should the shop help
fix the problem?
The Catalyst converter was after market.
--tj
