Does a 2003 320d e46 bmw have a timing chain or belt?

https://www.newtis.info/tisv2/a/en/e46-320d-lim/repair-manuals/11-engine/11-28-drive-belt-with-tensioning-deflecting-element/BzRYhMS at the bottom of the page

• Camshaft alignment/locking tool - BMW No.11 6 320.
• Flywheel locking tool - BMW No.11 8 010 (AT version GM-5).
• Flywheel locking tool - BMW No.11 8 182/11 8 183 (AT version 6HP-19).
• Flywheel locking tool - BMW No.11 8 182/11 8 183/11 8 185 (MT version H).
• Flywheel timing pin - BMW No.11 2 300.
• Timing chain tensioner locking pins - BMW No.11 3 340.

• Here are some general precautions
• Disconnect battery earth lead.
• Remove glow plugs to ease turning engine.
• Turn engine in normal direction of rotation (unless otherwise stated).
• Observe tightening torques.
• Do NOT turn crankshaft via camshaft or other sprockets.
• Do NOT turn crankshaft or camshaft with timing chain removed.

for more info email me at [email protected]

My guess is you blew the motor rebuilt it and never changed the catalytic converter.

Go to the link for your info.

How to Replace timing chain on BMW 328i E46

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http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/02-BASICS-Replacing_Your_Drive_Belt/images_large/pic01.jpg
Here you go

where is the location of a preheat control unit in a bmw 320d (e46)?

It has a timing CHAIN, not a belt. ALL BMWs have timing chains, unless it is an OLDER BMW, which only then might have a belt-driven timing.

See pictures below:

Hi some of them have a belt but yours being the M43 engine is a chain, the only thing to listen for with them is chain slap or an rattling around the chain area, a bit of research on the M43 engine also shows that the chain should be changed after 100000 miles as they become weak, Just joined here and found this unsolved i know its a bit late but hope the extra info helps