Question about 2001 BMW 330

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Engine light staying on.

Hi, exhaust emission value light is staying on with slight misfire occassionaly,understand there is a number of causes for this,but where would be a good starting point?

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Reading the fault code is the first place to start - without doing this it will be very difficult, but spark plugs are a good starting point for misfiring.

Posted on May 25, 2009

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1 Answer

Why is my indicator light staying on


Most likely, engine misfire or a defective oxygen sensor.

Jul 18, 2014 | 2006 BMW 320i

1 Answer

Tengo el codigo p0306 saben que es


Hi there:
A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we are left with a P0306 in the computer memory.


Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
- Faulty spark plugs
- Faulty coil or related wiring
- Ignition module or related wiring issues
- Ignition related sensor faults or wiring issues



Other details could be find HERE.


Hope helps.

Feb 11, 2013 | 1999 Jeep Grand Cherokee

1 Answer

The "engine - exhaust emission values have


Sounds to me that the O2 sensors are sensing a problem with the emissions, or other emision controls have detected a problem that may not necessarily cause a driveability issue.

If you have emissions inspections in your area of the country, then I would have it repaired before the next inspection.

Have the OBD-II scanner check out the computer codes and descriptions by Autozone or Advance Auto Parts for free, or buy your own scanner for under $100 from Sears or Walmart.

Good luck on the repair.

Nov 12, 2010 | 2002 BMW 3 Series

1 Answer

Light engine stay on when water temperature needle indicator is in the middle, engine works OK, and car too.


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

There are pages and pages of items that can cause a check engine light to come on. Having it checked with a scan tool will narrow down the problem area.

Nov 01, 2010 | 1997 Toyota Tercel

2 Answers

Causes for "Check engine" warning ligth activation


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

There are pages and pages of items that can cause a check engine light to come on. Having it checked with a scan tool will narrow down the problem area.

Not all systems are able to be read by your local auto parts store. For '95 and earlier cars, OBD I is used and can NOT be read by AutoZone or Advanced Auto. A simple paper clip can be used to jump 2 ports on the diagnostic port and have the Engine light flash a certain sequence. This will then tell you the code to refer to for troubleshooting.

The computer has detected a malfunction and set a code. Have it checked for codes with a scan tool.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.

Oct 22, 2010 | 2001 Ford Focus

1 Answer

Does exhaust leakage result in more fuel consumption? If it does how?


HI. In a way, yes. The increase is slight and not very much. it all depends on how you drive your vehicle under this type of condition.

Basically; the nature of a modern exhaust assembly is very restrictive, due to the emissions standards of today's laws. When a exhaust leak occurs, this will cause a slight relief of the restricted nature of the system, thus, allowing the engine to "slightly" breath a bit more. This state will increase the HP rate, slightly, thus, causing a small increase in fuel consumption. It will also cause the sound of the exhaust system to increase, slightly, as well.

The increase of HP and fuel consumption is very small, and it will not be noticed. You may only notice the difference in the sound of the engine, but that is about it.

Aug 17, 2010 | Honda Civic Cars & Trucks

1 Answer

Engine light on


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor


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Hello, Pls tell me what Happend when my engine light on bord is turned on.


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

Jan 08, 2010 | 2002 Hyundai Accent

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ENGINE LIGHT COMES ON WHILE DRIVING MERCEDES BENZ C230 2005 TOOK CAR TO DEALER AND THEY FIXED TO THERMS & COOLANT SENSOR 2DAYS LATER AFTER PUTTING FUEL IN ( HIGH GRADE) LIGHT COMES ON I DON' T WANT TO...


The check engine light comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.

A flashing check engine light is an indication of a severe misfire or problem that is likely to harm your engine. Immediate diagnosis and service is needed.

Some specific causes for the light to be on are:

Gas cap left off, not tightened, not installed correctly, or needs to be replaced

02 sensor

Engine misfire - error might clear itself after 3 complete warm-up cycles; not restarts, but warm-ups

At start up for a bulb check - Should not stay on

Problem in the emission system, including clogged exhaust or the catalytic converter not functioning properly

Dirty/clogged air filter

Dirty MAF sensor

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4 Answers

Exhaust emission warning light


this may be your egr valve, does it want to stall when its ticking over.

Jun 14, 2008 | 2000 BMW Z3

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