Question about 2003 BMW 325

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Stumble on accel on highway, fault P2240

Any ideas, can a post cat 02 cause this condition?

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O2 sensors and cat monitors will not cause this condition, try cleaning the MAF sensor, CRC chemicals makes the special spray, avail at most auto parts stores like Kragen.

Posted on Dec 03, 2008

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Service engine soon light flashes only under accelation obd code po401 car shakes and stumbles and has limited power


EGR is stuck open, but a flashing engine light can be a misfire code also detecting a rich condition, right back to the egr.

Nov 09, 2011 | 1999 Mitsubishi Eclipse

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O2 sensors keep failing and a evap leak code i put new gas cap did not cgehan ssomers11@gmail.com


Are you sure it's 02 sensors? Just because code says 02 sensors doesn't necessarily mean they're bad. Bad 02 sensor code can also indicate bad cat. converter. If 02 sensors read exact same reading before and after converter they will trigger OBC to "sensor fault" - they should be reading 2 different readings. (Pre CAT/POST cat) I'd suggest replacing cat converter before replacing sensors.

Mar 14, 2011 | 1999 Toyota Camry Solara

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My 2003 Pontiac Bonneville has a fault code of p0300 random cylindar misfire. How would you go about fixing it?


A code P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions:
* If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
* If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope helps (remember to rate this).

Oct 11, 2010 | Pontiac Bonneville Cars & Trucks

1 Answer

My 1996 sentra trembles when is on stop the motor runs ok all begins when I pressed the gas to begin moving and begins to tremble I already had it service but it did not stop the trembeling the mechanic...


simple test to know if the catalytic converter is clogged. Only a clogged cat could cause this kind of issue,, so as you try to go faster the problem would get worse because the presuure would have no way out. So to test a clogged cat you unplug the oxygen sensor and put in a pressure gauge. Ask the mechanic if he did this and if the pressure was well above 3psi. For you to have issues right off the line the pressure would have to be around 15 to 30 psi as soon as he reved up the motor. Or if you unplug the 02 sensor from the exhaust and drive the car and still have the same problem then the cat is not the cause. By creating a hole before the catalytic converter this allows the pressure out and if the cat was clogged the car should run better.
Personally I suspect you need spark plugs, or spark plug wires, or possibly a coil, or you may even have a clogged injector. Your discription of the symptom sounds like an ignition issue. If it only stumbles on accel but runs smooth at higer cruising speeds I would suspect possble a vacuum leak at the intake gasket or possible a clogged injector.

My point here is before you replace a catalytiic for a drivability issue only, you have to have excessive backpressure to cuase a drivability concern. Even if a catalytic was old and worn out and did not clean up any pollutants, which is its main purpose, the car would still drive just fine. It would just polute.

Jun 15, 2010 | 1996 Nissan Sentra

2 Answers

On a ford f-150 engine code P0303 what is the likely cause


A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.

Symptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

A code P0303 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs).

Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.

Apr 24, 2010 | 2006 Ford F-150

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Service engine light is on and diagnostic code is P0141 Bank 1 Sensor 2. What does this mean? Thank you


You may have a rear 02 sensor problem, but a repair shop will need to confirm it.

Mar 18, 2010 | 2000 Saturn SL

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No power in 4th gear on highway or in town will not accel 97 Jeep Wrangler 4x4 2.5


Accelerating and going nowhere? Might need a new cat (catalytic converter).

Oct 10, 2009 | 1997 Jeep Wrangler

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Engine light codes 02-3151 and P0420


Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that as the cat not ridding the exhaust of it's pollutants. This indicates that the converter is unable to preform properly. The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail. Many other engine operating system failures can cause the converter to not work properly.

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Ford f150 4.6 engine stumble


try cleaning the map sensor with map sensor cleaner.

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1 Answer

03 325I stumble on light accel on freeway, fault P2240


This is an O2 code, I have been told by a BMW tech that poor quality fuel can cause this as well as a dirty fuel filter which causes a slight loss of pressure and a stumble, I would do this, change the fuel filter, clean the MAF sensor for good measure and switch brands of fuel, otherwise a trip to the dealer may be in your future, average cost to repair this is about $250.00

Dec 03, 2008 | 2003 BMW 325

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