Check Engine Light

Depends on what the codes were, and what caused them. Clearing codes doesn't make the issue go away.

This depends on the vehicle. If the thermostat is stuck open the engine won't get to the proper operating temperature which could trigger the MIL (check engine light).

The oil change garage or Mercedes dealer has to reset the oil change light.

The oil change light goes by the mileage on the car, tripping the light on at the factory recommended oil change intervals.

The computer doesn't know you changed the oil in the car unless you tell it.

Read your car owners manual.

Sometimes a check engine light comes on due to the millage on your car and the time period it took to rack up thoughs miles. This gets people to make sure that take it back to the dealer for a regular maintenance.

If it is a 1996 or newer then it will have OB2. That means that a repair shop can hook up their scanner and it will tell them what the problem is. That will save you a lot of money because guessing is not a good idea.

Press and hold the mileage reset button turn the ignition on wait for 4 dashes to appear, switch ignition off job done !

this will not work. this only resets your service light and not the engine managent light.

The reduced engine power light means that there is a problem with the battery or power system. It almost always means a battery connection issue.

No, but the maintenance required light may very well indicate the oil needs changing. The Check Engine light only comes on when there is a problem with the emissions system.

With an OBD2 scanner.

We have a book that is literally about 3 inches thick that contains flow charts to diagnose why a check engine light is on. It will be impossible to enumorate all the possible reasons. The PCM has seen an area where it is seeing something other than what it has been programmed to expect from that area. It could be as simple as a loose gas cap, it could be as complex as a wiring problem. There are lots of senerios that would allow the vehicle to still run ok, such as a heater burned out in an O2 sensor, a problem in the evaporative emmissions system, vehicle running slightly lean or rich, intake air temp circuit problem, etc. You will need to get the system scanned to find out what area the problem is in, to narrow it down.

On the left side of your gear shifter you should have a little button that's been pushed in.The (S) stands for sports. When the (S) is lite, you can shift your car like a standard.

This refers to the second oxygen sensor on Bank 1. Bank 1 is the same side of the engine that cylinder 1 is on, the very front cylinder on the drivers side. It could need to be replaced, or there could be a short to voltage on the O2 signal circuit, or it could also be that the connector has been corroded, and needs to just be cleaned. I believe this code is the same for all vehicles, not just Toyotas.

http://www.unofficialbmw.com/e36/electrical/e36_reset_service_lights.html Here lies your answer

The Check Engine light is on because the computer has detected a problem with the emissions system. It may be nothing more than a loose gas cap or something more serious. You will need to get the computer scanned with an OBD2 scan tool. Some Auto Parts store will do this for free in some states. This will give you the fault code. This code will not necessarily tell you what the problem is but will tell you what component is being effected. Diagnosing the problem requires skill, knowledge, and experience. Do not just throw parts at the problem without actually knowing what is wrong. You may very well end up spending more money in the long run. If you do not know how to diagnose the code provided, then take it to a professional.

Have vehicle scanned to determine problem -- most auto parts stores will do this free.

The light blinking (as opposed to being on solid) indicates a serious problem (such as a misfire) that could lead to damage to the engine if it is run for an extended amount of time in this condition.

Check fuel delivery. fuel pump may be operating below threshold or fuel filter may be clogged.

It is above the inboard side of the fuel tank.

Water

Sounds like you may have a serious internal engine problem i.e. bad valve or blown piston. Do a compression check to try to determine which cylinder(s) are involved and whether problem is with a valve, piston, or head gasket.

the trouble code you have received actually means that the oxygen sensor is reading that your catalytic converter (which breaks down harmful emissions ) is no longer operating properly. Either the oxygen sensor is faulty and is giving a incorrect reading,which means you must repalce it, or the catalytic converter is faulty, and must be replaced.

P0300 Diagnostic Code - Random Misfire

Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues

Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM

The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.

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.

The check engine light is a general indication for a variety of problems. Most commonly it is a loose gas cap, oxygen sensor, MAP sensor, vacuum hose leak or faulty electrical. You need to have it read with a code reader to find the exact problem.

O2 sensor out of range.

The check engine light (service engine soon) 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 a parts store 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.