Question about 2001 BMW 330

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Oxygen Sensor Pad

Hi,

Can someone please tell me how many of these there are on a 330ci as I had one replaced in June and another (or is it the same?!?) needs to be done.

Thanks

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There sould be 2 of them u replace both at the same time

Posted on Sep 29, 2008

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Why is my 2002 Cadillac escalade burning so much gas and the check engine light is on


Hi June.

Please go for scan..
i think its time to change your oxygen sensor surly.

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How do you change the o2 sensor on a 2003 impala


I wouldn't trust anything the Zone tells you. Most oxygen sensor codes are NOT caused by the oxygen sensor. Of coarse, a lot has to do with WHICH O2 sensor code you have. For example, codes P0130,P0131,P0132,P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171 and P0172, are all valid oxygen sensor/fuel trim codes for a 2003 Chevrolet Impala equipped with a 3.4L V-6 engine.
How you would go about troubleshooting the problem depends on which "oxygen sensor code" you have. Many times, the code can be fixed by simply repairing a leak in a vacuum hose. Quite often, these codes are caused by faulty mass airflow sensors. Then again, every once in a while, the problem is actually the oxygen sensor itself. However, if you go by the knowledge and experience in diagnostics that exists at the Zone, you will be changing an oxygen sensor EVERY time. Then when that does not fix the problem, you will be out the cost of the oxygen sensor, PLUS you will STILL have to diagnose the problem to fix it!

Many people think that all an automotive repair technician does is plug in the "magic box" and replace all the parts that the box (computer) tells them to replace (and the people at the Zone like it that way). TRUST ME, it does not work that way! I WISH it was that simple.

FYI: On Board Diagnostic (OBD) Diagnostic Test Codes (DTCs) NEVER tell you what parts to replace. They are called DTCs because for a trained technician, they tell him which of the hundreds of DIAGNOSTIC TEST ROUTINES to perform in order to diagnose the fault and pinpoint the CAUSE of the problem.

Just a little professional advice from someone who has been diagnosing and repairing cars for about 37 years...do with it as you will.

Mar 22, 2012 | 2003 Chevrolet Impala

1 Answer

Engine light shows catalytic converter is at fault. How do I know which one, if there are more than one? How can I get a diagram of the exhaust system?


I believe that there is only one catalytic converter.
Don't be in a hurry to replace the catalyst. On an OBD II system, the computer will often throw a code for low catalyst efficiency when the oxygen sensors get old and slow to respond.
How old are your oxygen sensors? If they have over 100k miles on them, I would start there. Don't believe someone who throws a digital voltmeter on the oxygen sensor and pronounces it to be 'good'. A voltmeter will tell you if the oxygen sensor is dead, but it won't tell you if it is slow-responding, which often happens on 100k+ mile sensors.

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I have a 2001 jeep grand ckerokee with the small engine light staying on all the time. I have replaced 3 of the 02 sensers, new manifold,new muffler for the 02 reading, replaced the thermostat, and the...


The best advice that I can offer is to have your Engine computer scanned and diagnosed by a qualifed sevice technician and find out why the Engine Computer is turning the light on. If the light is on, it is because the computer has stored one or more fault codes. Fault codes NEVER tell you what parts to replace. They only tell you that one or more of the many systems monitored by the computer is operating outside of its expected "Range" or "Window of Operation". It is up to the person performing diagnosis to test the system that is failing and determine the actual cause of the failure and repair as necessary. You can spend a LOT of money replacing a LOT of parts and NOT fix the problem if proper diagnosis is not performed. Fault codes for the Oxygen sensors are RARELY caused by the Oxygen Sensors themselves. Oxygen Sensors are like informers. When someone within the engine management system is not performing their job, it is the Oxygen Sensor's job to rat them out. Replacing the Oxygen Sensors will only cause the new sensor to tell on the same problem. So, in your case, if you have replaced 3 of the Oxygen Sensors, that means that 6 Oxygen sensor have all been trying to tell you that there is a "Slacker" in the ranks! Stop wasting your money and fire the fool!

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1 Answer

Engine codes are 12, 51,21,53,55 can someone tell me what these codes are. engine is running extremely rich.


12 is battery has been disconnected recently, or went dead.
51 is Oxygen sensor stuck on lean mixture reading
21- no change in oxygen sensor reading
53- internal problem with logic module
55- is end of message/codes.

51 & 21, basically telling you same thing, but I wouldn't jump at changing oxygen sensor first, as a bad M.A.P. sensor can cause a rich mixture, thus oxygen sensor switches to lean to try and compensate. Personally, I'd go with map sensor first, check connections and vacuum lines if all good, replace it, then I'd go to oxygen sensor .

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1 Answer

Bmw 330ci m sport automatic 2001 makes a clinging sound when accelerating engine management light on and diagnostics says 228-e4-fuel trim bank 2- too lean. 227-e3-fuel trim bank 2- too lean its not...


Explanation:

According to my research and the BMW master mechanic, basically your oxygen sensor is getting an abnormal reading. The abnormal reading will result in the sensor being unable to adapt beyond its +/- 10% threshold to adapt for the fuel/trim mixture. Therefore, either your car is going to run too lean (not enough fuel) or too rich (too much fuel).

Problems:

1) Either your pre-cats oxygen sensors are bad.
2) Fuel pressure regulator
3) Leak in the air intake /vacuum system

I would think that it is probably your oxygen sensors. Replace that and you should be good to go. Thanks for rating my response and for using FixYa!

Jun 30, 2009 | 2001 BMW 330

1 Answer

Oxygen sensor


Somwhere along the lines someone might have installed an oxygen sensor eliminator kit. It basically sends a straight even signal back to the computer to tell it everything is ok. These are often used when people are trying to trick the computer on the vehicle to dump more fuel into the motor. I would check for a wire harness near the sensor that might just have a plug of some sort stuffed into it. If this is not the case, I would have to ask a few questions about the vehicle before I could give a more complete answer.

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