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P0156 - Cars & Trucks

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Bank 2 sensor 2,this O2 sensor.

Posted on May 06, 2013


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Posted on Jan 02, 2017

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Code p0156,p1131,p115,p0156 on my 2000 Ford taurus


P0156 - Problem with 0/2 circuit for downstream sensor of the front bank.
P1131 - Low activity of the upstream sensor for bank one. (rear)
P0115 - Problem with circuit for coolant temp sensor.

Just because you have codes for these sensors doesn't mean the sensor is the reason. The code merely tells you there is an issue in the circuit that needs to be troubleshooted accurately.

Oct 12, 2014 | Cars & Trucks

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Po156 po161 po446


code p0156 refers to heated oxygen sensor 2 bank2 circuit malfunction===causes--heating inoperative--wiring---HO2S--EcM
code p0161 refers to HO2S 3 -circuit malfunction==causes the same as p0156
p04456 refers to evaporative emission (EVAP) system-vent control-circuit malfunction====causes--wiring--EVAP canister purge valve--ECM

Oct 13, 2013 | 2005 Kia Spectra

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P0156 ford expor


That code means there is a malfunction in the 0/2 sensor circuit of the downstream sensor on bank 2 which is the driver's side. It could be the sensor, and air leak in the Catalytic Converter, the computer or related wiring

Aug 13, 2013 | 1998 Ford Explorer

3 Answers

I have a 98 f-150 5.4 triton showing coads p1131,p1151,p0170,p0174,p0136&p0156 goes on highway ok but idles rough and stalls


I would start with the Rubber elbow on the back of the intake, next to the IAC.

This has a habit of cracking, and causing unmetered air after the MAFS to get into the system. The closed loop control is not counting it, and the O2 sensors are reporting the lean condition on the back side.

Ignore the IAC notation in this picture ( only 1 I had ) You are going to want to remove the plastic cover on the throttle body, and take a look at the rubber vac line that is shown in this picture.
d7c4687.jpg

The other item could be the intake manifold is loose, but start with the vac lines, clear the code with a scanner, a battery disconnect for 5 min, or 2 driver cycles to see if at least the P0170 & P0174 codes are gone.
The P0136 & P0156 could be a melted wire as mcneb posted about, this is usually by the exhaust manifold. After checking and repairing the vac lines ( if required ) follow the harness from the 2nd set of O2 sensor ( think that is HO2S-12 & -22 if I recall correctly ) to the engine compartment.

Nov 17, 2009 | 1998 Ford F150 Regular Cab

2 Answers

O2 sensor location


DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window. The possible causes are:
  1. Pinched, shorted and/or corroded wiring and pins.
  2. Crossed sensor wires
  3. Exhaust leaks.
  4. Contaminated HO2S.
  5. Bad HO2S.
Since you didnt specify the engine size in your vehicle - please see the diagram below for the location of the sensor(s)

84f80ca.gif
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Apr 16, 2009 | 1998 Ford Windstar

2 Answers

98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+


po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes

Dec 15, 2008 | 2003 Ford E250

1 Answer

I have error codes p0156 p0161


  Check the wire harness near the top of the engine in the rear. They were good for rubbing through on the trans fill tube bracket. Judging by the code you have 4 sensors. you would be interested in the drivers side rear sensor.

Nov 11, 2008 | 1998 Ford Explorer

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