Question about 1997 Oldsmobile Bravada

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I have a 1997 Bravada that has a bad oxygen censor and a bad caytalytic converter. Would both of these problems cause a misfire, and , wich sensor is in bank 2

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Yes they can surely cause an misfire.

I cannot understand your statement "wich sensor is in bank 2"

If i am not wrong you are asking which sensor is present in bank 2 .

The 4th O2 sensor is located in bank 2

Posted on Mar 22, 2011

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Bad caytalytic converter can cause O2 censor readings to be abmormal. wont cause misfire can cause back fire bank 2 is right bank (passanger side) O2 censor can foul plugs causing missing

Posted on Mar 22, 2011

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The bad sensor can cause a misfire, and bank 2 is side where # 2 cylinder is.

Posted on Mar 22, 2011

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1 Answer

ENGINE LIGHT ON CODES P0141 & P0144


code p 0141 refers to heated oxygen sensor (HO2S) 2 bank 1--heater control--circuit malfunction===causes --wiring---HO2S--- ECM
code p 0144 refers to heated oxygen sensor(HO2S) 3 bank 1--high voltage ===causes wiring short to positive ---HO2S---ECM
also refers to oxygen sensor(O2S) 3 bank 1--high voltage ===causes wiring short to positive---O2S-- ECM
HO2S sensors are the units in the exhaust manifolds or before the cat converters
O2 sensors are after the cat converter
two completely different operations
use the special tool for sensors as the wires are easily damaged from the wrong tool use
as for misfiring you will get a P0300 (0300,0301,0302,0303 etc) depending on which cylinders are misfiring
when checking for misfiring the injectors , (blocked or not firing) are as important as plugs and wires
If the misfiring continues after sensor replacement , replace the ECM with a known good one as it is common to all fault codes and misfiring

Jun 06, 2016 | 2005 Hummer H2 SUV

1 Answer

Code P0420 on 2001 Olds Bravada


  • Inefficient Catalytic Converter(s)
  • Defective Front or Rear Oxygen Sensor(s)
  • Misfiring engines

Jan 19, 2015 | 2001 Oldsmobile Bravada

2 Answers

Egr valve for 1997 cheve Blazer code is 0300 misfireing what could be the trouble


usually this code is followed by another number 1-4 or 1-6 or 1-8 depending on how many cylinders your vehicle has ,, what the code you got is a basic P0300 Random/Multiple Cylinder Misfire Detected A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck ope

Jun 23, 2011 | 1997 Chevrolet Blazer

1 Answer

Engine missis at 2-2 half rpm under load.


Ok, if the car is misfiring it probably has a bad air/fuel mixture which can cause fouled spark plugs. The causes of a bad air/fuel mixture would could be a bad oxygen sensors or a bad engine coolant temp sensor. But that car is known for having bad head gaskets. What is probably happening is coolant and/or oil is leaking into the combustion chamber. you can check under the cars engine, where the head meets the block, for oil or coolant leaks where they attach. Or check the coolant for CO2 with a CO2 tester (found at auto parts store) and check for low oil. If it tests positive for CO2 in the coolant then its a blown head gasket. once you get the problem fixed you will probably need new spark plugs and possibly a catalytic converter (the longer it misfires, the more fuel will be burned on the cat filter and it will enventually melt)

May 03, 2011 | 1997 Subaru Impreza

4 Answers

Got a p0304 code come up on my 2002 olds Bravada, replaced camshaft and it still didnt fixed it?


P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0304 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope helps.

Apr 09, 2011 | 2002 Oldsmobile Bravada

2 Answers

Hi i have a sunfire 1997 recebtly my car started to missfire his idle stay beetween 500 and 1000 when step on breaks and it wants to shut down i have change spiplug crank censor map censor and the coil...


Have you changed the spark plug wires? This is the most common cause of a misfire. After changing the wires, I would then have the Timing checked and a new timing belt installed. If this doesn't fix the problem, you may have a Crankshaft Position Sensor or Camshaft Position Sensor failing. If this doesn't fix the problem, have your fuel pressure tested.

Feb 14, 2011 | 1997 Pontiac Sunfire

2 Answers

Check engine light is on and it reads Misfire on #2 cylinder. Also oxygen sensor bank2 sensor 1 and Bank 1 sensor 3 behind the converter. Engine running rough.


the engine miss fire can cause the other codes to set. you need to repair the miss fire and clear all codes after the miss is repaired then see if the 02 sensor codes return. the miss fire is probably a bad spark plug wire a good tune-up should take care of it ........HAVE A GREAT DAY

Jan 27, 2011 | 1996 Oldsmobile Bravada

2 Answers

WHERE IS THE OXYGEN CENSOR ON A 1997 GRAND MARQUIS


O2 sensors are located in the exhaust manifold near the Catalytic converter.
Some cars have the 02 sensor before the catalytic converter, some behind, and some before and after.

Simply locate the "bung" that contains the O2 sensor, and you will see the sensor connected to wires.
This is the best way to locate them.

-Jackson
http://urbanscooters.com/

Oct 11, 2010 | 1997 Mercury Grand Marquis

3 Answers

How many oxygen censor in 1997 mercury villager van I have to change new one some one told me more than two censor problem is check engine light is on


I have a 1997 Mercury Villager with many miles. We get poor gas mileage. The check engine light is on. I want to replace the 02 sensor but cannot locate it on the engine. Is there a link with photo of physical location of the sensor and what are the steps to replace it?

Oct 19, 2009 | 1997 Mercury Villager

2 Answers

Jetta temp sensor related to other codes?


P0422 - Catalyst below threshold.

Catalytic converter is clogged or out of medium.

Replace it.


ACTUAL DIAGNOSTIC:

Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0422 Code

* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter

Common Misdiagnoses

* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem



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Jul 11, 2009 | 1999 Volkswagen New Jetta

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