Question about 1999 Saturn SL

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Engine light is on. Reads a code 0133

02 sensor circiut slow response is this the upstream of down stream sensor? This is a 1999 Saturn SL1 4 Dr Sedan with an automatic transmission. Any help on getting it fixed would be appreciated, it needs to go thru admisisons.

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My manual shows, bank #1, 02 #1, which is upstream.

Posted on Jan 27, 2009


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Is the bank 2 sensor 1 oxygen sensor on a 2010 Saturn outlook on the upstream or down stream side?

The upstream on bank 2, which is the opposite of bank 1. Bank 1 is the side with the number 1 cylinder. Downstream oxygen sensors (after the cat converter) are always sensor 2, as in Bank 2, sensor 2.

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Were is the 02 sensor on a kia rio 2004

cars have 2 to 4 sensors in the exhaust system.If it is throwing an 02 sensor could does not mean you have a bad sensor,it means at that sensor it is burning lean or rich.Example if code reads bank 1 sensor 1 fault that is the sensor closest to engine.

Nov 01, 2012 | Kia Cars & Trucks

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I have a 1997 ford contour and the diagnostic tool reads left bank lean i was told that could be the fuel filter also my check engine light is on is this normal when the fuel filter needs changing?

It is not a fuel filter. If the left bank was lean the right would be also since the complete engine is fed from a single line to the injectors. Your O2 sensor is probably throwing the code to set the check engine light. The O2 sensors control the amount of fuel fed to the engine. Most Fords use an upstream and a down stream O2 sensor. From what you are describing I am betting your vehicle has way over 100,000 miles on it. The O2 sensors start going out after this point. They are subject to heat extremes and contamination from burned oil deposits and carbon and or fuel additives that you place into your fuel tank. If the code is reading or giving you a "lean" condition more than likely your upstream O2 sensor has bit the bullet finally.

Apr 14, 2012 | 1997 Ford Contour

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O2 sensor is comming up on service engine light warning, auto parts store says that there are 2 sensors on the car. Up stream and down stream. What are the locations for these and how hard are they to...

Hi Steve refers to the location of the oxygen (o2) sensors relative to the engine. The upstream sensor is the one closest to the engine. The downstream sensor is furthest from the engine. Think of it as the way a stream of water, or in this case, a stream of exhaust flows.... From the engine To the tailpipe.
Changing them is no problem, getting to them sometimes can be a bear,, if you can reach them,, its simply remove the old one with a couple of bolts, and unplug it,, and replace

Aug 25, 2011 | 2000 Saturn SL

1 Answer

Vic-tron--In your response to "guest

The banks refer to what side of the engine the sensor is on. Bank 1 is always the same side of the engine as the number one cylinder. Bank 2 is always the other side of the engine. Sensor refers to upstream or downstream. Sensor 1 is always before the cat sensor 2 is always after the cat.

in your case bank 2 would be the opposite side of the engine as the number one cylinder.

Jan 10, 2011 | Chevrolet Tahoe Cars & Trucks

2 Answers

Hi, I have a 1999 Saturn SC2 and my service engine light came on. I did a diagnostic on it and the code showed P1133. The guy at the auto shop told me it's an oxygen sensor, but didn't know if it was the...

First, I wouldn't let that guy work on your car. P1133 is "O2 Sensor Slow Response - Sensor 1" Anybody that has been in the auto repair business for more than a week should know that Sensor 1 is ALLWAYS the FRONT sensor.

Note: O2 sensor codes do not necessarily mean that an O2 sensor needs to be replaced. Most O2 Sensor codes are caused by something other than the O2 Sensor itself. (there are several different possible O2 Sensor codes for your car. P0131, P0132, P0133, P0134, P0138, P0171, P0172, P1133, P1134)

The most likely cause of DTC (Diagnostic TroubleCode) P1133 is contamination of the O2 Sensor. Replacing a contaminated O2 Sensor without repairing the source of the contamination will only result in a repeat repair. It could be caused by bad fuel, improper use of RTV sealant, engine oil or engine coolant. I have seen this caused many times by engine oil leaks that run down the exhaust and clog the holes in the side of the sensor shield. (The sensor must "breathe" to work properly)

Then on the other hand, if your vehicle has a lot of miles on it, the sensor could be just chemically worn out. In any case, the FRONT sensor is the one that is setting the code.

Jan 05, 2011 | 1999 Saturn SC

1 Answer


I guess one would come to the conclusion you need to replace the upstream O2 sensor. Buy one at a parts store and take it to a muffler shop, having a lift they can install it for you quickly and cheaply.

Nov 03, 2010 | 1999 Saturn SL

1 Answer

Engine Service light on reads catalyct converter bad can this truly be it with out any body checking and quoting me 1800. to fix?

That could also be a lazy O2 sensor behind the cat or a little leak in the exhaust inbetween the upstream O2 sensor and the down stream O2 sensor.

Jan 31, 2010 | 2002 Nissan Quest

2 Answers

Code: P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1

is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.

if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.

May 06, 2009 | 2001 Saturn SC

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