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Trouble code present po143 o2 sensor - 1997 GMC Jimmy

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I have a code Po143


you will need a new O2 sensor.

Feb 19, 2015 | Cars & Trucks

1 Answer

Code po157


02 sensor circuit low voltage ---answer is copied from obd-codes .com you can visit this site for more information if necessary Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143. The following symptoms may be present: MIL (Malfunction Indicator Lamp) illumination Engine performance issues Engine running rough Engine running rich (only if PCM is trying to add fuel to compensate for low o2 sensor voltage reading) Engine running lean (only if vacuum leak is large enough that PCM can't compensate by adding fuel) Poor idle Causes If you have reason to believe that your engine is running lean, fix that problem first, then clear codes and see if the P0157 code resets. An engine that is running lean could set this code, but usually there will be lean codes (P0171, P0174) present. The following could be causes: Air leaks in exhaust in front of o2 sensor giving false reading Engine running excessively lean O2 sensor connector damaged/corroded O2 sensor signal circuit is shorted to ground O2 sensor ground circuit is open O2 sensor has failed (it may be contaminated with fuel or coolant) PCM has failed

Read more at: http://www.obd-codes.com/p0157
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Oct 02, 2013 | 2001 GMC Jimmy

1 Answer

I have a 1997 1500 with a 5.0 Im getting codes po143 po172 po175 and po300. Im not sure what the cause could be.


Code 300 is for a random miss.
172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two.
Code 143 is for a rich mixture for sensor number 3.
All of the codes could be connected to a leaking injector or other fuel problem. Very seldom are all of the O2 sensors faulty at the same time.

Feb 22, 2013 | Cars & Trucks

3 Answers

What trouble code deffanition 147


DTC P0147 - 02 Sensor Heater Circuit Malfunction (Bank I Sensor 3)
O2 (Oxygen) sensors contain a heating element that allows the sensor to reach operating temperature quickly. This lowers emissions since it allows the engine to reach closed loop faster and also allows the engine to stay in closed loop at idle. The heater circuit is supplied a 12 V battery feed from the PCM or ignition circuit (depending on model) and a ground. The PCM (powertrain control module) monitors how long it takes for the sensors to become active after engine start-up. If it takes too long for the o2 sensors to reach operating temperature, this P0147 can set.

For this particular o2 sensor, there may be no noticeable symptoms other than:
MIL (Malfunction Indicator Lamp) illumination
Poor/ rough idle

Potential causes of an P0147 code include:
Bad o2 sensor heater circuit
Bad o2 sensor
Wiring harness problems

Possible Solutions:
Unplug the Bank 1, 3 sensor. With KOEO (key on engine off) use a voltmeter to check for battery voltage present at the o2 sensor connector (PCM side). (You can also do this with a test light. Connect to ground and touch lead to heater circuit supply. Light should illuminate with KOEO) You should have battery voltage present.

a. If voltage is present, check the ground side of the heater element also making sure a good ground is present. If it is, check for any faulty connections & then replace the o2 sensor. If you don't have a good ground, then there is an open in the ground circuit somewhere that will need to be repaired. Look for wiring harness contact with exhaust components or broken/missing connectors, etc.
b. If battery voltage isn't present with KOEO, check for a blown fuse supplying the heater elements. You may need to get a wiring diagram for this. If the fuse is blown, you'll need to check for a short to ground on the battery supply circuit before replacing the fuse. If you find none, and replacing the fuse re-establishes battery voltage at the o2 sensor connector, then the o2 sensor may have shorted internally, blowing the fuse. Replace it & recheck. (NOTE: it's possible for an o2 sensor's heater circuit to be open/shorted and the o2 sensor to still function).
c. If you have no battery voltage present with KOEO and there are no blown fuses supplying the heater circuit, then check for an open on the supply circuit. You can do this by ohming the circuit with the o2 sensor unplugged and the PCM unplugged. Repair and recheck.

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.

Feb 28, 2012 | 2001 Cadillac DeVille

1 Answer

Troubleshooting code p0420


P0420 = Bank 1 catalyst system efficiency below threshold. This DTC (Diagnostic Trouble Code) is set when the O2 downstream sensor indicates/measures the amount of hydrocarbons/oxygen present in the exhaust after it passes through the converter. When this sensor detects exhaust gasses identical/near identical to the upstream O2 Sensor (the actual gasses at the exhaust port - before the converter), it will set this 'efficiency below threshold' code. The catalyst has failed to 'convert' the exhaust gasses to CO2 + Water.

Sep 11, 2011 | 2006 Hyundai Sonata

2 Answers

2004 Dodge Dakota 4x4 trouble engine light on Code P0157 what is the problem?


Sensor 2 Bank 2 is the left rear oxygen sensor. It problably is bad
and needs to be replaced before your next inspection. The rear oxygen
sensor just monitors what is coming out and isn't as important as the
front oxygen sensor. The car will still run properly if you don't
replace it but will not pass inspection, in most states, if you don't
replace it. The part is inexpensive (about $30) but is hard to
replace without the proper tool. They make a special socket for
replacing oxygen sensors. You should be able to pick up the socket
for $15-$20. It has an opening for the attached wire. You could try
to remove the old one with an open ended wrench but you will probably
strip it. It's a 22 mm or 7/8 inch.

Jul 30, 2011 | Dodge Pickup Cars & Trucks

2 Answers

My 1997 Chevy 1500 W/T 4.3 failed emissions for PO143 02 Sensor Circuit Low Voltage (Bank 1(2) Sensor 3) What is this sensor for


O2 sensors read the exhaust gases and relays info to the computer. the computer reads that along with a couple dozen other things to determine best air/fuel mix

May 27, 2011 | Chevrolet 1500 Cars & Trucks

3 Answers

Reccieved P0141, P0147, P0340 as emission diagnostic trouble codes. What do these mean?


P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)

P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)

P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

Sep 20, 2010 | 1997 GMC Sierra

1 Answer

PO143 CODE


CODE PO143 - HEATED OXYGEN SENSOR HO2S 3,BANK 1 LOW VOLTAGE. P0OSSIBLE CAUSES AIR LEAKS IN THE EXHAUST SYSTEM,INTAKE MANIFOLD, VACUUM LINES.FUEL SYSTEM TOO LEAN DUE TO LOW FUEL PRESSURE OR CONTAMINATED FUEL.HO2S SIGNAL CIRCUIT IS SHORTED TO THE SENSOR OR CHASIS GROUND,HO2S IS DAMAGED CRACKED OR AIR REFERENCE HOLE CLOGGED.

Sep 01, 2010 | GMC Jimmy Cars & Trucks

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