Hi

Every time I turn the engine on my Coolant red warning light comes on immediately and does not go out.

I have checked the level and all good. Cleaned out the resevoir and sensor seems ok. However the light stays on, would appreciate your advice.

Cheers Joseph

XK8 - 1998 - Blue - 130,000miles

 

I had that problem, or a similar one. The red light would come on and the temp gauge needle never moved from the bottom. I read the code and it was a P1646 (I think), about the
ECT circuit open, or something like that. Anyway, I reset the code, the light went out and the gauge started working again. No problem since. I'm not sure what happened, but this
happened just after I had put the ODBII reader on it to check something else.

 

P1646 would be a failed O2 sensor.

On the warning light it's likely a bad sensor, bad connection, chafed wiring...

 

The float in the reservoir can get stuck or sink. The sensor can fall out the bottom and trigger the warning.

bob

 

No, it was a P0116.

 

Thank you everyone for your input, much appreciated. At the end of the day I found that it was a poor sensor connection at the bottom of the overflow resevoir. Such a simple fix. All OK now.

Thanks again


Cheers a Happy Chappy now.