Question about 2002 Pontiac Sunfire

1 Answer

My check engine light is on. I have had it checked out, it says it is my o2 sensor. How do i know which sensor it is, or should i replace both.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 30 Answers

It can be expensive to replace both, so try to find out the specific sensor by getting the OBD II code using a code reader and looking it up on obd-codes.com. when you get the info on what the code means, this is how to translate it...
the code will say something like "bank 1 sensor 1" or "bank 2 sensor 2".

Bank one is usually the sensor(s) before the cat converter, and bank two is usually the ones after the converter.

be sure you spend the money on an oem sensor and not a universal sensor. the universal sensors are ones that you have to wire up to the harness directly, and oem sensors are just put in and plug in.

and another little tid bit of advice- O2 sensors are usually rusted into place, so have some penetrating oil when you do it, I suggest PB Blaster or JB 80. you may also need to heat up the threaded "bung" that the o2 sensor is in with an oxy/acetelyene or a propane/oxygen torch to get it to turn for you.

Have patience, and you'll be able to do it yourself.

Posted on Jan 24, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

2003 chevy aveo #1 O2 sensor


#1 is the up-stream sensor (The O2 sensor located before the Catalytic Convertor). #2 is the down-stream O2 sensor. This sensor is located after the Catalytic Convertor. I hope this helps, let me know if you have other questions concerning this issue. Good luck.

Mar 18, 2014 | Cars & Trucks

1 Answer

O2 sensor is notr giving proper voltage signals and I need them check engine light to go off until I can produce the funds to replace the o2 sensor how can I do that?


The computer will keep lighting up the check engine light as long as there is a problem with a sensor in the car, which the O2 are. You will have to replace those O2 sensors to get the check engine light to stay off, if that is the only problem with your car. Have the trouble codes read from your car to see if anything else is also bad.

Aug 31, 2011 | 1996 Nissan Maxima

2 Answers

I have a 97 wrangler 2.5. Check engine light is on, running lean, loss of power and high fuel consumption. I have replaced the o2 sensors, reset check engine code. light stays off and engine runs great for...


Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

Mar 24, 2011 | 1997 Jeep Wrangler

2 Answers

During inspection I found out that a o2 sensor was bad but i was reading up on them and aparently there are four o2 sensors. 2 upper and 2 lower. How am i suppose to know what one is bad? secondly my...


The check engine light is blinking usually because of a misfire which can cause damage to the cat. The blinking check engine light does not necessarily mean the the cat is damaged.

The first thing you need to do is find out what codes are causing the check engine light to come on. If there is an O2 code it will help you identify the O2 sensor. The sensors are divided into to banks. Bank one is the same side of the motor as the number one cylinder. Bank 2 is the other side of the motor. Then they are divided into sensor 1 and senor 2. Sensor 1 is always before the cat. Sensor 2 is always after the cat. So if you had an O2 code for the Bank 2 sensor 1 O2 sensor it would be the opposite side of the engine from the number one cylinder and the sensor before the cat.

IMO, your first priority should be to figure out why the engine is misfiring and causing the check engine light to blink. Solving that first may take care of the O2 issues or the O2 could be the issue.

Dec 02, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Check engine came on I replaced the o2 sensor. check engine light


You need to know what codes you have stored
Your O2 Sensor, may not be the problem,even though you get an O2 Code. That may just be the symptom

May 31, 2010 | 1993 Dodge Caravan

1 Answer

Need to know how to check the oxygen sensors on a 1996 saturn sl


Don't know if this will answer it. O2 sensors send info to the computer to make adjustments to the emissions system. Over time the O2 sensors fail which cause the computer to light the "Check engine" light. Originally the "Check engine" light was dedicated to an emission system fault. Now manufactures use it for a variety of abnormalities. To know what the "check engine" light means you have to either take it to a mechanic or buy a OBDII scanner (around $100) and read the code yourself. I like to read my own codes. These scanners are good for all modern cars. Instructions are included EZ to follow.
Long story short, don't worry about it the check engine light will come on when O2 sensor fails. Happy motoring!

Mar 11, 2010 | 1996 Saturn SL

1 Answer

Check engine light for o2 sensors?


How long did the car run before the light cam back on? I don't know what type of OBD tester you have, Does it show the values of the O2 sensors.

Jul 23, 2009 | 2001 Subaru Legacy

2 Answers

I need to know what the definition for fault code


The #2 O2 sensor on the cataylitic convertor,could be caused by a bad sensor or bad convertor.

Jun 22, 2009 | 1998 Jeep Cherokee

1 Answer

Check Engine Lights On


if the code is for the rear cat o2 sensor i suggested to replace the cat. the rear o2 sensor is to tell the commputer ha good is the cats if the cat not burning the gas. the commputer need to see the o2 sensor to check the cat's

Apr 17, 2009 | 2000 Toyota Corolla

1 Answer

Don't know what type of sensor I need for my 93 Regal


If your check engine light is on the computer in your car can give a code. Aamco will read your check engine light for free. Might need a repair manual to find out what code means (which o2 sensor). If check engine light is not on you will probably need to get each o2 sensor tested by a mechanic.

Apr 02, 2009 | 1993 Buick Regal

Not finding what you are looking for?
2002 Pontiac Sunfire Logo

200 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

60960 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...