Question about 1996 Saab 9000

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1996 900S Saab O2 sensor replacement

How many O2 sensors does this car have? I see two offered, front and rear. I'm pretty sure I have a bad one as the car has 116,000 miles and the O2 sensor(s) has (have) never been replaced. If there are two, how do I know which one is bad.? I'm confused... Thanks

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Replace both with a generic brand as it will be cheap, look on ebay

Posted on Jan 17, 2009

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96saab 900s check engine light on code p1115 replaced rear 02 sensor then replaced front o2 sensor check engine light came back on.


you will also need to check the wires coming off both o2 sensors and also sometimes the main CPU gets fried always sending those codes

Sep 24, 2014 | 1996 Saab 900

1 Answer

Breaks on Saab 2001


Did you replace the front and rear or just the front? Rear brakes can make the pulsation as well. Also if your ABS system is activating that could be described as a "pulsation". The ABS problem is usually caused by a bad wheel speed sensor or ABS module failure. ABS modules can be rebuilt (see ebay BBA-Reman) Wheel speed sensors are available at most auto parts stores. Some Saabs require the replacement of the whole hub assembly.
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Jul 11, 2014 | 2010 Saab 9-3

1 Answer

What does the code 421 mean


the p0421 code on this vehicle is either caused by a bad catalytic converter or an oxygen sensor. your mechanic has a scan tool that he can verify if the converter is faulty by comparing the rear o2 sensor to the front sensor. If the rear o2 sensor's voltage is switching from rich to lean (01-1.0v) similar to the front's, then, it's a bad converter. The rear o2 sensor should keep a steady voltage reading. Have him do this test while at cruising speeds. good luck

Feb 28, 2014 | 2003 Mazda MPV

1 Answer

P0131 sabb 93 2001 po121 error codes


P0131 - O2 Sensor Circuit Low Voltage Bank 1 Sensor 1 (sensor is before the catalytic converter)

Possible causes- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
P0132 - O2 Sensor Circuit High Voltage Bank 1 Sensor 1
Possible causes- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

I am not really sure what is going on here with the same O2 sensor giving these lean and rich codes, if nothing else is apparent and the engine runs well you may have a defective O2 sensor.

Sep 13, 2012 | Saab 9 3 Cars & Trucks

1 Answer

2001 Toyota Camry - check engine light on - code p0420 - took to mechanic and he just hooked up code scanner and gave p0420 code - without checking anything else he said rear O2 sensor needs to be...


Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.

Sep 13, 2011 | 2001 Toyota Camry

2 Answers

Catalyst system efficiency below threshold


is that the code you get from comp is PO420 eng light if so worst news either you have an exh leak between o2 sensor 1 and o2 sensor 2 or the front o2 sensor is lazy or the front catyletic converter is not working

basicaly code is only triggerd when engine is hot and the front o2 sensor and the rear o2 sensor read the same voltage when conv is working the front o2 sensor will fluctuate rapidly from 0v to 1v and rear o2 sensor will remain steady at 0.5v

try to explain best i can plz vote comment or reply if you need more help

Jan 17, 2011 | Chevrolet Astro Cars & Trucks

1 Answer

Where are the front and rear O2 sensors?


The manifold and under below the engine on the exhaust pipe

Mar 06, 2010 | 2000 Hyundai Accent

2 Answers

I have a saab 9000 cde 1994 it drives nice but sometimes it starts missfiring and losing power for few minutes then runs smooth again any suggestions mike


Make sure all your injector connectors are clean and not corroded. make sure you have the correct resistor sparkplugs. And if both of those things are okay you probably have a bad direct ignition cassette.

Mar 20, 2009 | 1994 Saab 9000

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