smart center removed and replaced complete cylinder head due to misfiring caused by burned valve seats on #2 cylinder. This would have been a $2K repair if smart USA had not covered most of the cost, even though the car was out of warranty.
Check Engine Light kept coming on even after I cleared the fault with my Scanguage. Dealer ordered and installed a seal.
emissions valve stuck open
Replacement of timing case cover and replacement of the start/stop mechanism
Radio, Lights, other electrics worked. Engine would not turn over. Starter did not spin. Neutral sensor defective. Sensor replaced.
Transmission would not engage when car started and gear shift moved to drive or reverse. Required multiple re-starts, and occasionally a 10-20 minute "rest" before it would engage. Required software upgrade which dealer conveniently had.
Fuel pump failed
air intake system cracked. Instead of replacing, use a bicycle tire to patch the hose
Did not investigate past check engine light. My code reader indicated a secondary air fault, something I had fixed before by dealership.
Leaking oil. Oil gasket defective. Replaced under warranty.
Blowing oil splatter on the back when driving for long trips and engine is hot...Car smokes after stopping..
Oxygen Sensor and Sender Unit replaced
Electric cooling fan (behind the condenser) started to fail. The bearing failed causing a rattling noise as the fan blades contacted the housing.
check engine light
car had two burned valves, loss of compression in cylinders 2 &3. Mercedes corporate paid all but $500 to replace the head with a new one.
Muffler flex connector broke
Low compression in cyl 1 = valve job. Engine still runs a little rough on occasion AFTER the $5500 valve job. And the wrench symbol still pops up on the dash. But likely an electrical symptom.
Exhaust system. Muffler failed.
The oil developed a leak along the pan rail where the oil pan is bolted to the engine. To effect this repair, the oil pan was replaced.
Car rated at 5.8 litres/100km. I am getting 9.8/100km. I have repeatedly brought this issue to Mercedes Benz Dealer (Barrie, On) to no avail.
Flex pipe repair
They checked everything out, and updated the computer module. There was a $120 charge for checking out the system. There was no cost for the update, nor for a full inspection.
Exhaust gasket between converter and muffler
The oil pan was leaking. Dealer had to order special sealer which required another trip after they received it.
I had to pay $38.00 for new oil and filter, otherwise they would have reused the old oil.
Motor mount bolts broken. the timing cover had to be removed from the car and sent out to a local machine shop to have the
broken bolts removed and helicoils installed. They did that because of the cost of a new cover and to save time. Dealer removed timing cover and could not get gasket to seal. Attempted repair with engine in car, ruined three gaskets. After 31 days it was fixed.
Oil Pan Gasket was Leaking , all was done under Warranty
The oil pan gasket was leaking and had to be replaced. This is a common problem on the 2009s. Was fixed completely under the original warranty.
code p0442 - leak in evaporator emissions system
replace purge valve.
new transmission mount needed
Secondary air valve replaced.
I could move the gear selector but the transmission would not select a gear and would beep. Moving forward in Drive (when it worked) would fix problem temporarily. Car fine after clutch reflash.
Muffler failed. Secondary air injection pump replaced.
gasket on fuel cap replaced
sometimes would not go into reverse and sometimes would not go into park
fuel pump @42psi new plugs and filters and still will not run. Tries to start but just wont kick.
replace throttle valve, was stuck closed
broken pipe needed complete exhaust system
Oil pan gasket leaking. Replaced
cylinder head replaced due to worn valve guides leaky oil pan
Used 6 quarts of oil in 2 weeks, replaced the entire short block.
Wiring harness for O2 sensor chafing on hose from air pump. Wrapped harness in electrical tape, then ziptied a rubber hose around the harness to prevent further chafing.
replaced failed purge valve
muffler and tail pipe replacement
The alternator belt snapped. This caused the heating pump to stop, too. Smart Roadside told me that driving was fine, but a few miles later, I'd fried the engine :(
Oxygen sensors clogged. Replaced engine air filter. The one I had installed was too dense.
gas cap cracked, got new one installed by self.
needed a muffler assembly due to break in connecting metal hose leading to carburetor, probably from bad pot holes on NJ roads shaking car a lot.
Cooling system leaked crank shaft position sensor failed
Exhaust system broken flex pipe. Dealer wanted to replace the whole system, got my mechanic to replace the flex for a small fraction of the price.
Outside temp sensor failed. Was replaced. Unclear if repair successful. CEL came back on afterwards, the went back off. Need cold weather to test.
Muffler flex pipe was broken. Loose and melting back bumper. Muffler was replaced.
fuel pump fuse blew, stranding me, on 3 occasions. Dealer easter egged it, selling me $559 fuel pump. Fuse blew again. Tested my old fuel pump, under head pressure, for over an hour at 14vdc. Pump refunded. Pinched wire-factory defect.
Broken flex-tube. Replaced by welding in an after market one. Rest of exhaust and cat is in good condition.
Intermittent clutch engagement problem. Did software update, and is OK so far.
The check engine light came on. Owner's manual said not to drive it. The problem was a bad switch over valve. Valve ordered.
It was a repair for the check engine light that had come on previously. This visit was previously reported. A sensor had caused the problem and dealer replaced it on this visit.
Check engine light came on and took the car to dealer. Issue was engine sensor and made car run sort of rough. Resolved with new sensor.
Secondary air pump replaced. Took car to shop when check engine light came on.
Transmission and battery upgrade.
Engine light came on and stayed on.
Airflow valve was sticking. This has been a common problem with the Smart4two cars.
P0410 code shown on ScanGauge. Dealer replaced Secondary Air Injection Solenoid.
Replaced Air injection module.
shift module replaced
Check engine light came on. Diagnosed as faulty switch over valve, which was replaced.
Needed a new fuel plug
Check engine light came on due to faulty secondary air system switch over valve.
Engine light came on and was an emission valve. Repaired the next morning.
The car shut itself off in hard left turns 3 times.
Secondary air injection valve faulty. P0410
Error P0410 - Replaced Secondary Air Injection Valve.
Motor stopped as I was driving. Was able to restart immediately, after pulling over. Dealer found nothing wrong and no reason for the incident.
Dealer replaced the secondary air injection valve.
Alternator drive belt shredded which destroyed the oil pressure sending unit and an emission control line.
Air injection valve replaced.
Check engine light went on. Onboard computer diagnosed it. Took it to a non-Smart dealer who ordered then installed the part- an emissions control valve. Replaced defective emissions control valve.
Engine light error #po410 replaced part no more problems. 2.0 update reprogrammed transmission, replaced battery.
Check engine light, code P0455. "O" Ring on gas cap was misaligned. Once it was aligned, code cleared.
check engine light stayed on - required replacing emissions sensor on engine
check engine light came on, dealer checked error code, related to a sensor that failed not covered under warranty, paid for parts ($48) and labor; in an out in about 1.5 hours, this car is serviced by MBenz dealer so labor rates are higher
faulty gas cap
Fuel mixture rich, determined two intake gaskets needed replacement
Sensors indicated excessive rich fuel mixture. This is a repeat of the earlier repair issue which was corrected initially but then returned after a month. The dealer corrected the issue again at no charge.
secondary air injection valve malfunction
Failed crank position sensor. Car rendered totally useless.
Replaced leaking valve gasket allowed oil to pool around spark plugs.
Caused electrical malfunction.
Routine 10,000 mile service. They also did the Smart 2.0 upgrade - transmission reflash, new more powerful battery, shifter lube and gave out the new, updated owner's manual.
replace cracked motor mount
Gear shift stuck. Upgraded to 2.0, lubed shifter.
Took car to dealership service dept. to get maintenance reminder reset after doing an oil & filter change in addition to changing the transmission oil. I could not get the reminder to reset using several suggested methods.
Car was intermittantly throwing a P0410 code. The cel light was coming on more frequently. The secondary air valve was replaced and the computer reset. Concern appears to be resolved.
Secondary air valve bad.
Smart 2.0 software upgrade - enhance transmission to work like the 2009 transmission.
Water in gas
Reflash of transmission shifting software, termed smart 2.0. This makes the transmission shift points different and allows changing to the paddle shifters from auto mode by pulling on the shifter.
Check Engine Light X2 Codes failed O2 Lambda sensors. Necessitated removal of rear muffler box to remove by welding torch flame sensors seized into threads, due to no anti seize compound applied at time of manufacture/assembly.
Sometimes could not switch gear into D or R. Dealership said they had about ten cars more this year with the same behavior. Updating the firmware should fix the problem which after driving a few thousand miles seems it did.
Engine runs on two out of three cylinders. I keep it for now because I can still drive it around town as long as the engine stays relatively cool.
Updated transmission to 09 computer flash, lubed gear shift knob.
Had a "Maintenance Due" icon showup on the dash. Stopped into the dealership and the service manager did a quick reflash and removed the icon. No other issues before or since.
OE exhaust broke at the 'flex joint' - unable to replair. Replaced with an aftermarket unit (an upgrade).
Engine rattle at low speeds.
Small oil leak.
OBD II code PO401. Faulty secondary air intake sensor.
Car towed to Riverside Smart dealer 06/28/08, returned 07/21/08, after replacing gas gauge float. Part delivery took over two weeks.
Check Engine Light on. Engine fine---light bad.
secondary air injection valve stuck. Part replaced.
Sensor replace to correct engine light from coming on and staying on
check engine light fault code P0497 secondary air injection flow too low
Also fuel cap gasket had a hole and engine sensor light was on and reset.
Flex tube between exhaust manifold and muffler broke. Had new piece welded in place of failed part.
replaced main computer and throttle body! replaced throtle body
One of the individual accelerator position sensors was occasionally delivering a bad signal for at least long enough to throw a CEL and send it into limp-home mode. I replaced the accelerator myself.