Code P0131 - 2004 Chrysler Pacifica

Error code P0131 is described as O2 Sensor Circuit Low Voltage Bank 1 Sensor 1. This indicates there is a problem in the wiring, such as corrosion, breaks or separation.

P0131 BUICK - HO2S Circuit Low Voltage Bank 1 Sensor 1
https://www.autocodes.com/p0131_buick.html

P0131 HO2S Circuit Low Voltage Bank 1 Sensor 1

Bad Oxygen sensor. Needs to be replaced. Might as well replace both sensors, cheap and easy fix. Usually on the end of the exhaust header or just after. or both, if there is 2.

Essentially the same as P0136 and P0137, a P0131 code refers to the first oxygen sensor on Bank 1. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Bank 1 Sensor 1 is located in front of the catalytic converter.
Multidiag Access J2534 can help you reset it

code p0131 refers to heated oxygen sensor (HO2S) bank 1 low voltage. possible causes ---Exhaust leak wiring short to ground HO2S ans ecm I would check the wires are not touching the exhaust then replace the sensor with a genuine one as the settings may be different on an after market one giving a false code
.Code p0300 refers to random / multiple cylinder/s --- misfire detected. Possible causes include Spark plug/s--- HT leads---injectors--- ignition coils----low compression and wiring

This code does not mean to replace the sensor , testing is what is suppose to happen .
P0131 O2 Sensor Circuit Low Voltage Bank 1 Sensor 1

Honda Civic P0131 02 Sensor Diagnosis

HI ghosthunter6 codes P0131&P0137&P0341 indicative of having electrical short .
P0131 Front Heated Oxygen Sensor Bank 1 harness is open or shorted .
P0137 Rear Heated Oxygen Sensor Bank 1 harness is open or shorted .
P0341 Camshaft position sensor harness or connectors (The sensor circuit is open or shorted) .
code B1218 horn relay coil circuit short to voltage battery .
IT could be cousin problem with other sensors .
First replace horn relay and clear E C M codes
IF problem and codes P0131&P0137 come back you need o2 sensors .put I don't thank so.
YOU MUST REPLACE HORN RELAY .OK

good luck

http://www.obd-codes.com/p0131
basically a bad O2 sensor, click the link for more info

http://www.obd-codes.com/p0174
system running too lean, check and clean the MAF sensor, again click the link for more info