Has anyone had a similar experience? If so, how did you resolve it. The> check engine light is very unnerving to me.>

First, a code reader does not diagnose your vehicle it reads a fault code > (check engine light) generated by your vehicle. A fault code provides the > mechanic with a starting point and then they have to use a diognistic > manual to trouble shoot the fault code it could be as simple as a loose > wire. Any who if you knew what the codes were you could get an idea of > what is generating it.>

It is very un likely that it is your canister system, 99% of the time it > is your gas cap o-ring that has failed and just simply replace the gas > cap. The gas is the largest cause of a check engine light. The link will > take you to page that discusses codes and you can even put in your code > and it will tell you waht it means providing a starting point. Any > mechanic that just replaces items by set fault codes is not a good > mechanic and does not have basic the knowlegde of diognostics.>

Get a new gas cap, it is cheaper than $90.00 and it is more likely the > problem.>

http://www.iequus.c­om/obd_def.asp>

HarryS>

"MercedesGal" <cmathis642@aol.com­> wrote in message > news:e6cd0a6cda9bd6­8fd5e7e962c1ef87ee@l­ocalhost.talkaboutau­tos.com...>> The Check Engine light just came on on my 1997 Range Rover 4.6 HSE. I >> took>> it to the mechanic who hooked it up to the diagnostics machine. The>> readout said that the sensors for 3 items relating to emmissions controls>> needs to be replaced. He reset the check engine light. Today the light>> came back on. I took it to another mechanic who said that only one of >> the>> valve canisters needs to be replaced, rather than 3 the other mechanic >> told>> me. He also said that the check engine light may mean that my gas cap is>> loose. He wants to charge me $90 for a diagnosis.>>