Hugh54

Yes Tony, I just pulled the alternator apart and the problem is in the overrunning clutch. It overruns both ways so the alternator was not spinning as fast as it should, or in the, end at all, and probably caused a low charging voltage. I should have checked the charging voltage long ago. Brushes were worn right down as well. A bit more knowledge! I had no idea they even had an overrunning clutch. Cheers

For anyone who read my post, and those who answered, about the CEL on all the time with a downstream O2 sensor code (P0138 I think) that I couldn't fix after replacing O2 sensor, CAT and them a CEL eliminator, I decided to leave it and see what eventuated. As it turns out it seems to have been the alternator. We got 3 or 4 thousand kms out of it and on Wednesday the alternator failed making a nasty bearing noise. I replaced the alternator and after a reasonably long run the CEL has not come on again. So it seems like it was a low charge rate. It's now charging at 14.1 and no problems. Cheers

In my case even if there were a problem with the EGR or air leaks etc, I have fitted a CEL eliminator which fits between the Cat and the O2 sensor, thus taking the downstream O2 sensor out of the exhaust stream. The signal supplied to the ECU is constant. Apparently they are used for hot motors where the air/fuel mix has been altered so that you don't get the CEL light all the time. I've given up on it at the moment. Other things to worry about like a water pump.

I think if it's petrol the filter is in the tank. There is an access panel in the back floor near the rear end of the sliding door opening.

Hi. I am a new member hopefully looking for a solution to a problem that has defeated me so far. We have a H200 2008 Hiace Commuter that I have converted to a camper. It has done around 195000 kms. Some time ago the engine check light came on and the code reader indicated that the problem was the downstream 02 sensor (code P0038 from memory). So far I have done the following in order: (none of these have fixed it) replaced the downstream 02 sensor with a non-genuine sensor replaced the cat converter (again non-genuine but not a free flow) cleaned the MAF sensor as much as possible from up through the air cleaner box with cleaning fluid (I didn't want to take the entire bumper off to remove it) taken it to a dealer who replaced the 02 sensor again with a genuine one fitted a check engine light eliminator between the downstream O2 sensor and the cat convertor to trick the ECU replaced spark plugs (which badly needed replacing) in the vain hope that it might have some bearing on the problem None of these has fixed it. After resetting the codes it comes on again after some 50 or so kms. I have had it to both dealer and a local workshop who specialise in EFI etc in the hope that they know more than I do and they cannot isolate the problem. All else seems fine. The engine runs well, doesn't use excessive fuel (although the exhaust smells a bit). We have driven it for several thousand kms as is without any problems at all apart from the CEL being on all the time. I am now thinking that the problem is possibly in the ECU itself. I am now just ignoring it for the present in the hope that a) it won't get any worse or b) the cause will become evident. If anyone has any info that might shed some light it would be appreciated. Thanks