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O2 sensor 1996 silverado 5.7

Had a po430 code changed post o2 sensor and the code came on again

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 66 Answers

SOURCE: O2 sensor problem

I have a 97 gmc sierra .This truck is the same as the chevy ok.Its a 350 5.7 liter 4x4 Z71.I took it to auto zone which was my first mistake.They put it the scanner and said bad O2 sensor.Ok so which one is it i said.They dont know.Well there four (4) O2 sensors in this truck i hope you know that.I had to replace all four of them before i had to take it to a real shop.It seems the fuel pump i replaced a week earlier with an auto zone fuel pump was bad.Ive changed my feul pump 4 times now and have 235000 miles on still running.You need to get your fuel pressure checked.It should be 65 psi to start it and 55 psi to run it.If the pressures are good it could be a different O2 sensor or maybe the mass air flow senor.My last option would be the fuel pressure regulator because it seems to be a waste of time and money.I would get that fuel pressue checked first.Good luck.

Posted on Nov 25, 2008

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JShreader
  • 50 Answers

SOURCE: O2 Sensor on a 1996 Cadillac Eldorado

Hello mrsalbert, my name is JShreader. Thank you for choosing fixya.com

Depending on which oxygen sensor you are looking for...there are several of them throughout the Exhaust System. I will start out by giving you a brief description of what and oxygen sensor is, and they're general purpose.

DESCRIPTION
Four Heated Oxygen Sensors (HO2S) are mounted in the exhaust system where they monitor the oxygen content in the exhaust stream. There is an oxygen sensor mounted in each exhaust manifold and one on each end of the catalytic converter. the oxygen sensor located in the front exhaust manifold is the Bank 2 Sensor 1 (Front) sensor. The oxygen sensor located in the rear exhaust manifold is the Bank 1 Sensor 1 (Rear) sensor. The oxygen sensor located in the Y-pipe ahead of the catalytic converter is the Bank 1 Sensor 2 (Pre-converter) sensor. The oxygen sensor located in the catalytic converter outlet is the Bank 1 Sensor 3 (Post-converter) sensor.

OPERATION
An oxygen sensor acts like a battery because it creates its own signal voltage once it reaches operating temperature. This voltage is produced when the oxygen content in the exhaust stream is different than the oxygen content in the atmosphere. A lean condition (high oxygen content in exhaust) will produce a low voltage (near 0 volts) and a rich condition (low oxygen content in exhaust) will produce a high voltage (near one volt). The PCM provides a reference signal voltage (0.45 volt) and a ground to the sensor. The PCM reference voltage is necessary because the oxygen sensors do not provide their own voltage until they reach operating temperature.

HEATING ELEMENT
the oxygen sensors also incorporate a heating element inside of the sensor housing. This heating element is energized with the ignition On and allows the sensors to reach operating temperatures quickly. The PCM can then use oxygen sensor information sooner after engine start-up.

PCM INPUTS
The PCM uses oxygen sensor information during Closed Loop operation to constantly adjust fuel control to reduce exhaust emissions. Because the oxygen sensors provide information sooner after engine start-up, exhaust emissions are reduced. Faulty oxygen sensors will cause various driveability conditions and will set a DTC.

That being said...I uploaded a .pdf for you of pictures showing the locations of ALL the oxygen Sensors on your Vehicle. You can download it by clicking HERE.

I hope this helps you. If you have any more questions or need any more diagrams, please don't hesitate to ask...Thanks again, JShreader!

Posted on Apr 01, 2009

countrysi248
  • 443 Answers

SOURCE: 98 silverado codes po420,po430,po446

if the cat was pluggin you would see this as your going down the road it would not get to top speed .. They act up usually only run 40 top speed.

Posted on Apr 12, 2009

  • 10 Answers

SOURCE: Nissan Maxima 1996 issues-sensors

Dear Gandhi
1) You better check the 'Idle control relay' - and pray this is not your computer - who may be shorted ( The Computer that govern all elec. functions in the car - is also getting signals from your Mothor Mounts' to ensure a more balanced ride' If one or more of the Motor Mounts ( There are 3 ) are defective - they send a signal to the computer - and the yellow light ( Check engine soon) - will appear'
2) A Computer can only be fixed by a Nissan dealer ( est. $750 ) 3) The Idle control valve - can be adjusted too ( Again - by a Nissan Dealer only .
4) It is NOT an easy problem nor cheap . In short - your best bet is with the dealer - and ask them for a diagnostic ONLY ( est. $100 ) Don't tell the dealer what YOU think or did .......just tell them the 'Yellow light comes on' .......they'll take it from there.
Sorry I don't have better news today .

Best of luck
David

Posted on Apr 16, 2009

  • 265 Answers

SOURCE: 1996 Nissan Maxima o2 Sensor Location

check out www.maxima.org

Posted on Feb 05, 2010

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Code po430 2007 trailblazer ss 6.0 engine light cam on why?


Code po430 is your O2 downstream sensor on your right bank telling you that you either have a problem with your catalytic convertor ot possibly your O2 sensor or wiring are bad.

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Po430 comes up about every 100 miles


Id have to check the o2 sensors on datastream with scanner, depending on o2 sensor data and short term fuel trim, could be either an o2 sensor bad or the catalytic converter bad, you might also check the fuel filter, if your lucky

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Po430 code


P0430 means you have trouble to emission. most likely at catalytic and 02 sensor, replacing plugs might help if it is not been replace for a while about 70k miles this might help your idling. if you have access to scanner check fuel short trim a higher trim indicate fault at upstream 02 sensors.

Nov 06, 2013 | Cars & Trucks

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I have a po430 code bank 2 what 02 sensor is it?


P0430 is a catalytic converter inefficiency code for bank 2.

You didn't list a year make and model but I do see you have a GM. It is not an O2 sensor. It is the catalytic converter. You can confirm this by watching O2 data with scan tool. If the downstream O2 sensor switches simular to the upstream than the Cat is no longer doing its job.

Bank 1 always refers to the same side of the engine as the number 1 cylinder. Bank 2 is the opposite side. again without a year make and model that is about as detailed as I can get.

Let me know if you have any questions and thank you for using fixya.com.

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Locating of po430 code


this is an obd2 trouble code table, it can help you understand the meaning of code.
for this code, you need
First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

Sep 13, 2011 | 1996 Mercury Sable

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Engine light came on. Mechanic says oxygen sensors or catylitic converter. Shouldn't it give a specific code to determine which?


Yes, I would say that on an OBD-II system on a car 1996 and up it should be able to detect which Oxygen sensor is faulty or giving a false signal, or with a little bit of diagnostic time determine if the catalytic converter is plugged or not functioning using a sniffer.

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sounds like O2 sensors to me. I havent changed one on a mustang yet but I havent had any trouble with any others that I have done, they screw in like a spark plug but you will need a special tool, I hope this helps you.

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Check Engine Light was came up with code po430.


its going to be either an o2 sensor(bank 2) or a catalytic converter

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P0420 & P0430 codes 99 silverado


codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

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98 silverado codes po420,po430,po446


if the cat was pluggin you would see this as your going down the road it would not get to top speed .. They act up usually only run 40 top speed.

Apr 12, 2009 | 1999 Chevrolet Silverado 1500

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