I dont believe the Impala 2003 uses a DPFE sensor as part of there Emissions system.
code 34 = knock sensor/circuit
34
mass air flow sensor or manifold pressure sensor. your car will have either or.
1 5/16" or 34 mm socket, torqued to 159 ft.lb.
intake manifold vaccum leak
It is on the left side of the intake manifold.
Low voltage (high vacuum) at mass air flow sensor (or MAP sensor).
See Headlamps on page 6-34 of your "Owner's Manual", under Section 6: Service and Appearance Care - Bulb Replacement...
On the firewall on the right side. if the car is 3.3l v6 then the car doesn't have a map sensor but it does have a mass air flow sensor the code is the same for both of them only a 2.3 has the map sensor so don't be fooled by this by code 34 the chilton book is very helpful
What is causing this 93 j30 shakes at idle and slow excel code 34/51 : infiniti online mechanic? Code 34 is a knock sensor code.
code 44 -02 sensor indicates a lean problem,code 45 is a rich problem,check the ecm wiring connections,#15 and#8 check also for a vaccum leak at the tbi base gasket.a code 33 or 34 indacates a faulty map sensor,my 89 Chevy 4x4 read code 44 followed by code 34 which turned out to be my vaccum line to my map sensor was off.
it doesn't have one it is electric uses a vehicle speed sensor on rear of trans.