Hey guys my 1995 325i m50 engine 5 speed is having trouble passing smog, a friend told me it may need a new temperature sensor, the problems is high hydrocarbons which he said the engine is running too rich, any ideas? Thanks

__________________
This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW E30 Coolant Temp Sensor Replacement

High hydrocarbons indicate incomplete combustion, not rich. Incomplete combustion is caused by an engine misfire. The other tailpipe gases are used in conjuction with the failed gas to pinpoint the problem.

- Nick