Should be two pre-cat, and two post-cat sensors......

Those sensors don't come into play right away though, engine has to be warmer then 'cold', and O2s take a couple minutes to heat up, and start working. If it runs rough at startup, O2 sensors aren't the problem. Somethin' else is goin' on.

Are you getting any misfire codes?

 

2003 one cat, two o2 sensors.

 

Unless its california emissions??? Or are they still just two sensors?

 

In in CA with a CA emissions truck... one cat, two sensors is all it's got lol

 

Started to have lack of power and engine light on
code for O2 SENSORS:
Changed 16 spark plugs in January to irdium?
O2 sensors
PVC
MAP sensor

Started to get worse in March
Runs like bad fuel
RPMs all over the board

Took to shop
They replaced the Throttle body and accelerator pedal sensor
Engine Light still on
Ran ok for 3 days

We replaced Throttle cable because of corrosion

After chatting with DODGE forum
Go back to copper plugs
Did that yesterday
Still messing up
​​
in park runs awful
Put in drive sounds better
RPMs not jumping when driving around town
this got better since spark plug change back to copper
we only have 2 Mopar O2 sensor
On order

This morning a new code
PO300 twice?
PO132 which has been on since January

MIL ON
Monitors 3 incidents
Catalyst
Evap
Misfire

New this morning
Fuel
Comp

Thinking about ordering vapor canister purge valve from dodge

 

Is the purge valve stuck open?

 

Is there a way to test?

 

Probably. I don't recall if it is open at idle or not.....