I have a nissen primera 18000 the malfuntion light stays on indecating timing chain is stretched and needs replacing. only done 45000 miles. it only came on when bad weather started. could be sensor. any ideas

Yeap sure would but why will it snap, chains last along time I only replace a chain if it gets a bit stretched and starts to rattle and then I usually rebuild the motor, rings, bearings, valve grind, water pump and any thing else while its a part and looks like it needs a birthday, but if you just want to keep it going and compressions good and oil pressures good I have just done the chain to quiet it done and done thousands of miles with no problems every engines got its own problems to figure out. cya Neil

Your 2003 nissan primera has a timing chain.

check your pcm module to make sure it functioning right, they usually have a warranty from the factory up to 80,000 miles. Also, check all of your coils, and plugs. If all that checks out you may have the same problem I had with mine at 66,000 miles which is unusual. Which is it may be the timing chain. The dealership said it's strange, but mine was stretched. I haven't had the problem since then. It was the timing chain the entire time which caused the problem

for most maxima's .. hold the trip counter in when you turn on the ignition .. a few models have a little rubber cork that you remove .. that exposes a push button ..

You change the timing chain now when your Jeep has indicated from a check engine light on. The timing chain in engines these days last as long as the engine will, there is a timing chain tensioner to ensure there is no slack.
When the timing chain has gotten stretched to much, your Jeeps PCM will indicate that with a check engine light on your dash and will be indicated with a DTC codes from a scanner.
So no worries about replacing your timing chain and keep up the regular maintenance, if you have a Mechanic tell you other wise, there just looking for money and your looking for more then just a timing chain being replaced.
You can bet that chain, chain tensioner, timing gears, water pump and might even throw in a cam replacement will be in his recommendation.
Thank you for using fixya and be safe.

Changing a sensor doesn't stretch a chain.

It needs a CASE learn.

Timing belts stretch they just snap.If the leading side was installed loose the belt could have jumped.Also check the timing belt pulley keyway

HI, I GOT NISSAN MICRA 1.2 SE 2005 PLATE ONLY DONE 59000 MILES. MISSING! I HAVE CHANGED COIL PACKS, CAMSHAFT SENSOR, TIMMING CHAIN, STILL THE SAME PROBLEM. I HAVE ALREADY SPENT 1000.00 POUNDS. IS THERE ANYONE WITH SAME PROBLEM?

timing chains in most cases never need be repalced for the life of the engine, timing belts on the other hand last about 60,000-100,000 miles.

80-100K miles