What does check engine code p0154 mean - 1996 Dodge Intrepid

p7038 is not an obdll code also no vehicle information and as to p0154 --------Error Code P0154 is described as Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1. This code appears when the PCM (powertrain control module, also known as ECM or engine control module in other brands) remains at or close the 0.450 set voltage point.

It is sensor.
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https://www.yourmechanic.com/article/p0154-obd-ii-trouble-code-o2-sensor-circuit-no-activity-detected-bank-2-sensor-1-by-jamahl-walker
https://repairpal.com/obd-ii-code-p0154

code p0154 refers to heated oxygen sensor (HO2S) 1 bank 2 -- no activity detected===causes --wiring---HO2S---= ECM
it also refers to oxygen sensor (O2S) --no activity detected--===causes --- wiring---O2S sensor---ECM. May be you did not replace the sensors causing the fault.

Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).

http://www.obd-codes.com/p0134

P0154 02 Sensor No Activity Circuit

its a bad o2 sensor code bank 2 sensor 1

P0156 code means :Oxygen Sensor Circuit No Activity Detected (Bank2, sensor1) I'm not sure but i think it's on the exhaust manifold!!!

P0154 is an OBDII code for a 'lazy' O2 sensor, it is not switching fast enough for the ECU to adjust parameters when managing your engine-you probably are over 100,000 miles now, they get a coating on them that makes them react slower than expected-time to replace, they run about $50 and are pretty easy to change.

both codes point to the oxygen sensor on bank 2 sensor 1 ..
that would explain the rough running also .. the engine will default to a rich condition ...

p0154 indicates no activity on bank 2 sensor 1 oxygen sensor
p01153 is showing "low switching" for bank 2 sensor 1 oxygen sensor ...

there may be a wiring pigtail coming from the sensor. that plugs into another connector a few inches away .. check that connector for damage or corrosion .. if its ok then you likely need a new oxygen sensor ..

its not a good idea to continue driving with this condition since it will eventually damage the catilytic converter. that is probably getting very hot now with the extra load of fuel ..

Here it goes.
P2197 - Front Air Fuel Sensor (O2 sensor) Bank 2 - Sensor 1 Signal stuck lean.

P0154 - Front Air Fuel Sensor (O2 Sensor) Bank 2 - Sensor 1 Heater System Malfunction.

P2254 - Front AIr Fuel Sensor (O2 Sensor) VS Line high voltage.

IF Trouble codes P0134 or P0154 are present diagnose them before code P2254.

The first thing I would do would be check the heater circuit. You will have ground, and 12V+ to the 02 sensor heater line on a cold start. This heats up the oxygen quicker and allows it to operate in the correct amount of time. 9/10 times if there is a heater circuit code it is the oxygen sensor. But 1/10 times it is a blown fuse. So checking the voltage at the sensor is a quick test for P0154.

I would backprobe the signal line when the vehicle is at a full operating temp with a graphing meter (if avail) or use a DVOM. You should see it switch between .1 volts to 1V. It should not continuously move up and down. This indicates the computer is in good fuel control.

Diaginosis the heater circuit first is best because code P2197 can be set from anything that can cause that motor to run lean. (Plugged fuel filter, low fuel pressure/volume, vacume leak).

Hope this gives you a solid path to go on & good luck.