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O2 sensors which wire sends signal to comp

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The white wires are the heater and the grey and black are the sensor wires the grey should be the one to the pcm

Posted on Nov 22, 2008


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P0135 code

The heater element in the sensor has failed. Very high chance that replacing the O2 sensor will fix this issue.

Rare, but the engine computer may not be sending a signal to heat the sensor or a wire can be damaged. but this is very rare. Try replacing the sensor first. Its very simple.

this code is showing you the computer knows the circuit is not complete for some reason.

May 07, 2014 | 2009 Toyota Highlander V6

1 Answer

Will not start p2045 p2197 p0190 p2247 p2245 p2248 p2249 p2518 comes up

code p2045 refers to reductant temperature sensor--high input==causes --wiring faulty sensor
code p2197 refers to heated oxygen sensor(HO2S)1 bank 2-- signal stuck lean===causes HO2S---fuel pressure---injectors---intake leak
also refers to oxygen sensor (O2s)1 bank 2 -signal stuck lean===causes--O2S--fuel pressure---injectors---intake leak
also refers to heated oxygen sensor (HO2S) 1 bank 2--implausible signal===causes wiring---short to ground--short to positive--HO2S---ECM
code po190 refers to fuel rail pressure (FRP) sensor-circuit malfunction===causes --wiring ---fuel rail pressure sensor---ECM
code p2247 refers to heated oxygen sensor (HO2s) 1 bank 1 reference voltage--open circuit===causes--wiring ---ho2s
also refers to o2s 1 bank 2 reference voltage ---open circuit===causes wiring---o2s
also refers to HO2S 1 bank 2 ---no signal===causes wiring--ho2s---ECM
code p2245 refers to HO2S 1 bank 1 --reference voltage --circuit low===causes--wiring short to ground--ho2s also refers to o2s 1 bank 1 circuit low===causes wiring short to ground--o2s
code p2248 refers to the ho2s I bank --performance problem===causes --wiring--ho2s
code p2249 has the same causes short to ground---ho2s and o2s
code p2518 refers to a/c refrigerant pressure sensor B ---circuit high===causes wiring short to positive--a/c refrigerant pressure sensor.
so after all that replace all the ho2s and o2s sensors using the correct tools so that the wiring is not damaged and check the wiring back to the ECM for burns and rub marks.

Dec 30, 2013 | Cars & Trucks

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Engine code p0138

no year, no joy, all i know is 1996 to 2013
no model stated,,, ouch. wrangler?
this is federal usa spec code P0 are. that.
O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Read more at:

the rear oxygen sensor (not front) is sending wrong data.
it reads too high.
this means, 1: the wires to it are cut, burnt, melted or corroded.
or the sensor is bad
i might mean the CAT is bad. (the FSM shows the trip limits.)
since no year, and no car model stated, i cant get exact.

high is 1v, we know that, but is the failure , for over 1v?
if yes, the sensor is blow to bits or not connected.

ill roll the dice (snake eyes) 1996 wrangler, 4.0L , A/T

O2 (B1 S2) Circuit Short to Voltage
Number of Trips to Set Code: 1
Trouble Code Conditions:
Engine started; engine runtime more than 4 minutes, system voltage over 10.5v, ECT Sensor more than 180?F, and the PCM detected the O2 signal was more than 1.50v for 3 seconds.
Possible Causes:
  • O2 signal tracking (wet/oily) in connector due to short from signal to power circuit
  • O2 signal circuit is open
  • O2 ground circuit is open
  • O2 is damaged or it has failed
  • PCM has failed (never,will it be ,here.....well protected , im sure.)

1.5 v is illegal reading from the 02
O2 means the natural state, of 2 Oxygen atoms. the come in pairs.

what I do is connect my scan tool and plot B1S2 02 sensor
if it reads wrong, i clean and check connections.
ifi it still reads wrong its kicked to the curb (a new one)

hand wired i can get them for $20
PNP from Bosch $50 (plug it in, and play)

Nov 28, 2013 | Jeep Cars & Trucks

1 Answer

Service engine light codes say o2 sensor yet both are new

Check the wires from the O2 sensors for worn insulation and bare spots. They are probably rubbing on the body somewhere and sending false signals to the computer. Hope this helps.

Feb 22, 2012 | 2003 Saturn ION

1 Answer

I have changed the camshaft position senson several times on my 05 Neon and now replacing it doesnt do any good. im getting an intermittent camshaft positon circuit error. how do I test the wiring and what...

I never had a problem with the cam sensor in my neon, drove it for 10 years. However, the O2 Sensor fault tends to send a signal that a bad Cam sensor is present and if the timing belt is lose or jumps that will send a false code. The timing belt on these uses a spring tension device in the 2000 to 2003 and a hydraulic tension arm in the 2003 and later models. The hydraulic tension assembly tends to hang and allows the timing to be erratic. Not enough to throw it off all the time, apparently when the belt pops it comes free, but that is all it takes to through the cam timing off and that causes the computer to send a fault signal or random misfire signal. Look at the Timing belt after replacing the O2 sensor if the O2 replacement doesn't resolve the problem.

May 21, 2011 | 2005 Dodge Neon

1 Answer

Where are the o2 sensors located on 2004 dodge durango and how many are there?

I believe you may have three (3) O2 sensor, (2) of the sensor is on ether side of the exhaust down pipe and some times called up stream O2 sensor, the third O2 sensor know to some as the down stream O2 and is after the Catalytic converter.
The up stream O2 monitors the left and right side banks and sends signals to the ECM to make the adjustments to the injectors to keep the proper air/fuel ratio.
The down stream O2 monitors the catalytic converter and sends signal to the ECM if the catalytic converter has gone bad.
Good luck and hope this helps. If you get it scanned at Auto Zone, they should be able to let you know which O2 has gone bad so as to not change all three. You could always check the wire harness to the down stream O2 for corrosion.

Jan 29, 2011 | Dodge Durango Cars & Trucks

3 Answers

Oxygen sensor heater control circuit, low voltage bank 1 sensor 1 p0031 code. will this make it hard to start?

yes and also may make it run rough or lack power. the o2 sensors tell the computer how to make the engine run

Feb 13, 2010 | 2002 Hyundai Santa Fe

1 Answer

I have a 1998 chevy malibu what wire for the o2 sensor is the signal wire and theres four to choose from

On the front O2 Sensor, the signal wire s Purple. On the rear O2 Sensor, the signal wire is Purple and White. (You will probably have to look at the wire colors on the main harness side of the O2 Sensor connector, not on the sensor itself.)

Nov 19, 2009 | 1998 Chevrolet Malibu

2 Answers

Location of oxygen sensor

Under the truck, driver side exhaust pipe, there are 2, 1 is before the catalytic converter, the other is after. They screw into the side of the exhaust pipe.

May 29, 2009 | 2004 Dodge Ram 1500

1 Answer

O2 sensor

The return signal is pin A circuit number 413 which is a tan wire.

Aug 11, 2008 | 1998 Chevrolet Malibu

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