Question about 1998 Chevrolet Malibu

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O2 sensor There are four wires on my oxygen sensor. I need to know which wire sends the signal FROM the sensor TO the computer.

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

Posted on Nov 02, 2008


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What color wire coming off the engine harness grey or brown connects to the blue signal wire on the 02 sensor which color is the signal wire to the computer

posted 3 times now and forget to say FRONT SENSOR>
right, not the Rear 02 sensor....?
and still no engine stated.!
nor country, (USA calif, usa FED, or canada)
strike three you are out.
there are 3 engines,
based on all 3 engine schematics, my wild guess
is 7AFE engine. (the brown wire clue) 1,8L
4AFE (1.6L)
or 1ZZFE engine, DOHC 1.8L

Feb 28, 2016 | 1997 Geo Prizm

1 Answer

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

2 Answers

Where are bank 1 and bank 2 o2 sensors on 2001 Chevy 1500?

The 02 Sensors are located in the exhaust pipe passenger side behind the catalytic converter. you'll see the wires on each one, you may have as many as four base on your engine size.

Jan 01, 2013 | 2001 Chevrolet Silverado 1500

1 Answer

Has any one had problems with bosh oxagen sensor not working properly

Hi there:
Are you buy same or OE part replacement according with the Hyundai part number catalogue? This is important. Keep in midn that you need reset or delete all previous code stored in the car computer.

DTC P0131 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
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.

There may be no visible symptoms to the driver, other than the MIL (Check Engine / Service Engine Soon) illumination.

A code P0131 may mean that one or more of the following has happened:
- Faulty o2 oxygen sensor
- Short to voltage on O2 signal circuit
- High resistance or open on O2 signal circuit

Possible Solutions:
- Replace faulty sensor
- Repair short, open, or high resistance on o2 signal circuit

Now, about DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

A code P0135 may mean that one or more of the following has happened:
- O2 Heater element resistance is high
- Internal short or open in the heater element
- O2 heater circuit wiring high resistance
- open or short to ground in the wiring harness

Possible Solutions
Repair short or open or high resistance in wiring harness or harness connectors
Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Aug 17, 2012 | Cars & Trucks

1 Answer

What do i have to change if codes po1151 and po155 come up on my 1999 lincoln town car?

P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1).

Potential Symptoms: You will likely notice poor fuel economy the illumination of the MIL.

Causes: A code P0155 may mean that one or more of the following has happened:
O2 Heater element resistance is high
Internal short or open in the heater element
O2 heater circuit wiring high resistance
open or short to ground in the wiring harness

Possible Solutions:
Repair short or open or high resistance in wiring harness or harness connectors
Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

P0156 - 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
The o2 (oxygen) sensors measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important for the proper operation of the engine. Innacurate or faulty o2 sensors can cause the PCM to add or take away fuel based on the faulty o2 sensor voltage which can cause a host of problems.

A P0156 code refers to the Bank 2,2 o2 sensor or the downstream (post-cat) o2 sensor on Bank 2. It is a four wire sensor. The PCM supplies a ground circuit and a reference voltage circuit of about 0.5 volts. Also for the o2 sensor heater element there is a battery voltage supply wire and another ground circuit for that. The o2 sensor heater allows the o2 sensor to warm up faster, thus achieving closed loop in less time than it would normally take for the exhaust to warm the sensor up to operating temperature. The O2 sensor varies the supplied reference voltage based on oxygen content in the exhaust. It is capable of varying from about 0.1 to 0.9 volts, 0.1 V indicating lean exhaust and 0.9 V indicating rich exhaust. This P0156 code indicates that the Bank 2, 2 o2 sensor is stuck low for too long or isn\'t active at all.

Symptoms: Often post-cat o2 sensor problems present few symptoms since they are inputs to the PCM to monitor catalytic converter quality and don\'t directly control fuel. sometimes no symptoms are noticeable. However the following may be possible on some vehicles:
MIL (Malfunction Indicator Lamp) illumination
Decrease in MPG
Increase in tailpipe emissions

Causes: Potential causes of an P0156 code include:
Bad O2 sensor
Signal shorted to voltage
Wiring problems due to contact with exhaust components
Holes in exhaust near o2 sensor

Possible Solutions:
If you have access to a scan tool, check the signal voltage for the Bank 2,2 oxygen sensor with the engine at normal operating temperature. Is it stuck low currently? If so, increase RPM for a few seconds and see if it affects the reading. If it begins working with increased RPM, check for holes in the exhaust near the o2 sensor that may cause a false lean. If the exhaust pipe is intact, the sensor is sluggish, replace it.

If the Bank 2,2 o2 sensor voltage reading remains low with increased RPM, unplug it and then observe the reading. It should have increased to about 0.5 volts or thereabouts. If it did, check for water intrusion or other connector problems. If none are found, replace the shorted o2 sensor. If the voltage reading is still stuck low after unplugging the sensor, then suspect a wiring problem. Using a voltmeter, with the o2 sensor unplugged, check for voltage on the signal circuit at the o2 sensor connector(PCM side). It can vary with model, but should be about 0.5 volts and not above 1 volt. If the voltage reading is too high, repair short to voltage on signal circuit. If the signal voltage checks out, suspect the PCM.

Hope this helps (remember to rate this answer).

Jun 06, 2011 | Lincoln Town Car Cars & Trucks

2 Answers

Oxygen sensor not sending signal, code 21 found, what causes it not to send signal?

Faulty O2 Sensor, Shorted Wire to the sensor, improperly connected or out of order wires in a Universal replacement Sensor. Most likely it is a faulty O2 Sensor if you haven't had it replaced. If you have had it replaced or replaced it on your own you may have gotten the wires mixed up when you put the plug together on a universal replacement part that is commonly sold at Auto Zone and Advance Auto stores. These are designed to work with multiple vehicles so you have to wire the plug yourself. The wiring mix up happens most commonly when you have a 3 wire system and have to figure out which 3 wires to use on the universal since it comes with 4 wires or when you don't get the slice adapter put on the wire correctly.

Feb 12, 2011 | 1991 Chrysler LeBaron

1 Answer

I have a 2002 lexus IC300 . The problem i have is the car went off the road and tore the wiring off the o2 sensor where the two pipes come together...I cant find the plug to plug the new sensor into. Does...

I take it the wiring has been ripped off from the underside to the sensor. You will just have to follow the wiring from the connector under the carpet under the passenger seat inside the car to where it exits to the exhaust. Fit the new sensor with an open ended spanner, carefully feed the wires/plug back through to the connector. The oxygen sensor has four wires. Two, usually grey, are to supply the sensor heater with power, they only work when hot so they have internal heaters. The other two wires are the signal feeds back to the ECU that report on oxygen levels.

Sep 09, 2010 | 2002 Lexus IS 300

2 Answers


Only way to tell is count the number of wires coming from it. You also need to know if its the right or left bank and upstream or down stream. Upstream is before cat converters and by or in exhaust manifolds, down stream is behind converters and only measures converter effeciancy.

Mar 08, 2010 | 2001 Volkswagen Passat

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

Oxygen sensors

you have four on this truck. bank one sensor one is "black and white" b1 s2 "brown" b2s1 "light green" b2 s2 "red/white" good luck post as fixed thanks

Sep 20, 2008 | 2003 GMC Sierra 1500

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