Question about 2004 Chevrolet Impala

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I have a 2004 Impala with code PO131 and PO171.

We replaced the cat converter and the code still come up. If it is the O2 sensor were is it located? Any suggestions?

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O2 sensor is by the cat and sometimes there is 2 of them one before and one after the cat id look on the exhaust manifold most likely there is one there

Posted on Dec 05, 2012

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: Trying to replace two O2

There are three. One should be just in front of the converter and the other two are in each of the exhaust manifolds.

Posted on Dec 27, 2008

  • 2 Answers

SOURCE: 2002 chevy impala o2 location?

it is locared on the driver side on top of the transmision

Posted on Feb 27, 2009

  • 6 Answers

SOURCE: diagnsis codes

replace your bank 1 (driver's side) position 1 (pre-convertor) O2 sensor. It probably will be completely black, the p0134, 134 and 1133 are all for that O2 sensor, the P0171 is for lean fuel trim on bank 1, and the p0300 is for a misfire probably caused by the lean fuel mixture.

Posted on Apr 03, 2009

Molson02536
  • 3854 Answers

SOURCE: O2 sensors trouble codes come back/after being replaced

What were the codes??? You should have gotten one code if it was only one O2 sensor that went bad. If all three O 2 sensor went bad you would have gotten three different codes. P0031 (bank1 sensor1) P0051 (bank2 sensor2) P0061 to P0064 O2 sensor after the catalytic. Hops this helps. 

Posted on Jul 03, 2009

  • 708 Answers

SOURCE: 2oo0 chevy blazer cel and code p0171 and p0174

Depending on the engine it will have between 4 and 2.

If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

Posted on Oct 05, 2009

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1 Answer

PO131 PO151 PO154


codes PO131 PO151 PO154 okay. code PO131 - o2 sensor circuit low voltage bank 1 sensor 1. code PO151 - o2 sensor circuit low voltage bank 2 sensor 1. code PO154 - o2 sensor circuit no activity detected bank 2 sensor 1

May 19, 2013 | 2000 Nissan Xterra

1 Answer

Po 131 po171 obd2 codes on 04 kia sorento... indicates o2 sensor ? whish one and where


The problem may not necessarily be a bad O2 sensor. An incorrect air fuel mixture may also trigger this error.

To see if the air fuel mixture is right you may have to check the ignition for bad plugs or coils. Check the vacuum hoses to and from the engine for leaks, cracks or loose connections. Check also the timing. Inspect the throttle body or the actual intake manifold for build up of dirt. A bad injector could also be the culprit.

The error code Po131 is for the sensor before the catalytic converter. Inspect the cables and the socket of the sensor. Check also for leaks in the exhaust.

Apr 07, 2011 | Kia Sorento Cars & Trucks

1 Answer

Check engine light code is p0420 and it dont tell me where this sensor is what is catalyst system bank 1 low efficiancy


There is not a problem with a sensor there is a problem with the catalytic converter. P0420 sets when the downstream o2 sensor is either reading higher than expected or reading simular to the upstream O2 sensor. Either way it is usually the catalytic converter that is the source of the problem and rarely the downstream O2 sensor.

The Catalytic converter is located in the exhaust system under the car. Catalytic converters from either the dealer or a quality direct fit part from a reputable manufacturer are recommended. Cheap cats lead to lots of problems!

Feb 13, 2011 | 2004 Chevrolet Impala

2 Answers

Where is the oxygen o2 sensor located on 2004 impala bank 1


I have a 2002 Impala with 3.8L, and just replaced my Bank1 O2.
It is located between the firwall and the middle of the engine, straight down past the spark plugs. Maybe 12 inches from the top of the engine.
As I recall the plug for the sensor is clipped to a bracket at about spark plug level.
I recommend using the crow foot style wrench to remove and install.

Jan 04, 2011 | 2005 Chevrolet Impala

2 Answers

Error code p0032 on 2004 dodge caravan. what is the code?


Hi.

P0032 means HO2S Heater Control Circuit High (Bank 1 Sensor 1).

It means high impedance from O2 sensor, check wiring to sensor and replace the sensor.
Check O2 sensor located in bank 1 (cylinder 1 side- see here), and after the catalitic converter (there is also an O2 sensor before cat converter).

Jul 31, 2010 | 2004 Dodge Caravan

1 Answer

02 censor


Your car should have two O2 sensors. One will be located after your catalytic converter. The other one should be located before your catalytic converter somewhere between your headers and your cat. Rarely, on some vehicles, there's a 3rd O2 sensor which is located also somewhere between the catalytic converter and the headers.

Oct 29, 2009 | 2004 Chevrolet Impala

1 Answer

Codes are Po442,PO420,PO131 and PO401.I beleive these all have to do with exhaust emission or leaks


okay po442 isevap leak check gas cap amd right front tower in engine check evap line for broken hose,po131 bad o2 sensor top sensor on rear exhaust manifold,po420 is bad catalyic converter but could be o2 sensor.i would replace o2 first reset eng lingt and go from there, hope this helps good luck.

Oct 07, 2009 | 2003 Dodge Caravan

1 Answer

Diagnsis codes


replace your bank 1 (driver's side) position 1 (pre-convertor) O2 sensor. It probably will be completely black, the p0134, 134 and 1133 are all for that O2 sensor, the P0171 is for lean fuel trim on bank 1, and the p0300 is for a misfire probably caused by the lean fuel mixture.

Mar 30, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

2 Answers

Determine which O2 sensor to replace.


There are many reasons for a PO171 code, these need to be checked before replacing O2's:

  • Vehicle driven low on fuel or until it ran out of fuel
  • One or more injectors restricted or pressure regulator has failed
  • Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
  • Air leaks after the MAF sensor, or air leaks in the PCV system
  • Air leaks at the EGR gasket, or at the EGR valve diaphragm
  • Exhaust leaks before or near where the front HO2S is mounted
  • HO2S is contaminated, deteriorated or it has failed
  • Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
  • Base engine "mechanical" fault affecting one or more cylinders.
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