Highlighted below is the high pressure fuel pump. It's fed by the low pressure fuel pump in the fuel tank and is spun by the cam shaft. However, to get to this point you have to remove the airbox, intercooler and gear change motor. Disconnect the pipe highlighted...
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Engine
451 Lambda Sensor Removal
Euro 4 Lambda Exhaust Remove the rear panels and the crash bar. Spray both lambda sensors with PlusGas before attempting to remove with a 22mm spanner. The upstream sensor in in the upper elbow. The 2nd is in the silencer. This uses the same 22mm spanner. Disconnect...
451 Lambda Sensors
These sensors measure the air/fuel mixture ratio and adjust the engine parameters. If either of these are faulty you can have an engine light on, poor running or bad mpg.
451 Valve Clearance Specs
Sometimes, information doesn't need to take up loads of pages. Sometimes, the information is really all that needs to be on the page. This is one of those pages. I could use a massive font to take up more room I suppose but I won't. Important These clearance readings...
452 Roadster Engine Removal
452 Roadster Engine Removal Step 0: Disconnect the battery earth connection. Look at the engine, just above the oil filter. You'll see the coolant drain plug. Use a 6mm allen key to open it a couple of turns. I recommend putting some hose over it to guide the coolant....
452 Roadster Fuel Tank Drain
Fuel Filter The fuel filter is quite well hidden, it is behind the nearside rear wheel arch. Jack the car up, remove the wheel and remove the arch liner. On each end of the filter is a connector with an orange clip. To disconnect the pipe you just have to push the...
452 Roadster Water Pump Change
Faulty Water Pump? The water pump is designed to leak slightly when it needs replacing. Most of the time it is worn bearings but the have been known to break blades. This reduces the performance of the pump and bits of the blade can block water ways and make noises in...
453 Belt Change
Post yourself under the car on the right hand side. You'll see a cover that partially covers the crankshaft pulley. This sucker has got to go. Grab yourself a 10mm socket and take out all of the bolts that hold the cover to the engine. Get off the floor (make all of...
453 Coolant Specs
Smart 453 Petrol Pre-Mixed Coolant (MB326.6) Product Name Manufacturer ALLIANCE PRIMECOOL GP P-40 Mercedes-Benz Pty. Ltd. /Australia, Victoria, Mulgrave/AUSTRALIA Antigel YORK 813 MOTOREX AG, Langenthal/Schweiz AVIATICON Finkofreeze F40 RM 50:50 Finke Mineralölwerk...
453 Dump Valve
I don't have a 453 turbo so I can't show it being done on the car yet. But I do have a turbo for the 453. The arrowed black box is the recirculating valve. It's coming off. Remove the 3x Torx30 bolts... ...that are located around the outside. The recirc valve just...
453 Engine Cover
453 Fortwo & 453 Forfour Engine Cover Some people had problems with the single quarter turn fastener in the previous Fortwos and Roadster. The 453 replaced the single fastener with something easier but takes ages to undo. Here is the 453 engine cover. There are 6...
453 Error Code P26AB
In 2019, an error code started being mentioned on various forums for the 453 model. In the subsequent years since this I have only ever heard of it happen on US cars so my assumption is that the failed part is a US only fixture. P26AB This is a generic error code but...
453 Fuel Filter Change
453 Fortwo & Forfour None of the 453 models have a replaceable fuel filter. Petrol non turbo Fortwo – no replaceable fuel filter Petrol non turbo Forfour – no replaceable fuel filter Petrol turbo Fortwo – no replaceable fuel filter Petrol turbo Forfour – no...
453 Gearbox Fluid Change
The 453 comes with 3 option for the gearbox. The turbo and non turbo petrol model had the option for either manual or auto. The electric drive model only came with a fixed ratio gearbox (not yet covered here). Manual Gearbox Fluid Change Post yourself under the car...
453 Lambda Sensors
Non Turbo B90 Position Number Of Wires Bandwidth Part Number Upstream (manifold) 5 Wideband A453 542 05 00 DownStream (catalytic convertor) 4 Narrowband A453 542 06 00 Turbo B91 Position Number Of Wires Bandwidth Part Number Upstream (turbo) 5 Wideband A453 542 05 00...
453 Stiff Manual Gear Change
You might not know by looking at the price but the 453 is a cheaply made car. There are a lot of "that'll do" engineering, especially since it's a rehashed Renault. Manual gear shifters can feel good or shit. Being cheap, the 453 manual gearshift feels shit. However,...
453 Wastegate Fault
Pulsing? Lost boost on your 453 turbo or going into safe mode? It's becoming a common issue. This is the turbo on your 453 engine. Highlighted in the photo below is the part causing the issue. The wastegate actuator. The wastegate actuator adjusts the boost by...
454 Clutch Actuator Setting
Note Do not touch clutch actuator on the tappet or the rubber bellow. Never touch the electric connector. The servo motor sensor system can be destroyed by static discharge. Removing The Clutch Actuator Switch off the ignition. Wait for the stopping time of the...
454 Forfour Gear Selector Removal
You have the 5 speed manual gear box. Don't tell me, the gear change is stiff right? Time to remove the selector mechanism and get it fixed. Disconnect both battery terminals, earth 1st. Go down between the battery and the air intake and remove the single bolt that...
454 Forfour Stiff Gear Change
OK, so you have removed the gear change selector because the gear change was stiffer than Ron Jeremy. Ideally, you shouldn't need a hammer to change gears. The issue is down to the pivot in the selector mechanism arm. See below, the original pivot is hollow and...