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I'm guessing intake manifold. Could be something simple(firing order) Hopefully you just have lead in wrong order. Most likely, major leak!. Check compression. onn every cylinder. open radiator cap, listen or exhaust through collant system. If you have one oddball on compression check, or you hear noise from coolant area, I know this sucks, but you're going to have to reinstall everything. Make sure you use sealents to make it easier from the auto parts store. Hope it helps.
Keep on the Service Dept. I had 9 CEL issues in 13 days, they have done everything from replace gas cap(pin hole puncture), 5 software updates and 4 NLVD valves replacement.Purge valve replaced, fan resistor replaced and make sure that battery post is check( campaign) Phone service dept and give them your VIN # and ask if there is any campaigns outstanding, if there are any just keep on taking the hybrid back. Just to let you know with the software updates you will notice a drop in mileage, as I am avg 525 km, but getting better. What is your mileage/tank and avgL/100km ( mpg/100miles) if you don't mind mentioning.
find some junkyards in the phone book and call them until you find a replacement rim. they are about 20 bucks used and most likely about any GM rim from the 90s will fit it. have your old tire put on your new used rim, balanced, and you are good to go unless the tire itself has been damaged.take a look at the tire size so you know what size rim you have, most likely a 13,14, or 15 inch size.
There is a good chance that a service bulletin or a safety recall was issued for your E-class. There were several recalls sent out for re programming the sbc module which is the brakes for the vehicle. To find out if there are any open campaigns on your vehicle you can get in touch with the Mercedes Benz dealership in your area and ask them to run a VMI on your car. They will need the VIN on your car in order to run a VMI. This will let you know if there is any open campaign on your car or if they have already been performed.
go to an auto parts store and they will be able to print off the firing order. it shows you everything from cyclinders to coil pack or distributor. you can also look up these auto part stores online and most have them on their. good luck.
DO NOT ERASE THE CODES. There is Freeze Frame data that the technician may need to print off and attach to the Repair Order if it is covered under a CAMPAIGN. The misfire code P0303 relates to cylinder three not contributing. It could be a spark plug, ignition coil or an injector. I would check these items first before taking it to a dealer. There is also a campaign (RECALL) for the Power Valve (NTB05-058b) where the screws may have become loose. This is located inside the intake manifold.
The P0420 code could be a defective catalyst. The parameters for the catatytic converter may need to be widen through the ECM reprogram. It could also be one of the following bulletins or campaigns (RECALL): NTB09-046, NTB06-004b or CAMPAIGN NTB03-070b (R3007, R3014, R3015, R3016 & R3017). You will need to take the vehicle to a NISSAN dealer to verify if your vehicle is affected by these. Simply ask the service writer to check if your vehicle has any open campaigns. This is free. The bulletins may cost you.