LH 2.4, 3-wire probe.

I would appreciate some opinions on the following readings:

Resistance cold - 4 Ohms, resistance hot 5.6 Ohms

At hot idle, the voltage cycles between 0.2V to 0.8V, at the rate of about one reading every half second. It couldn't be called "rapid", as it is very easy to see all the values, which cover the whole range. The "average" reading is definitely above 0.5V. In fact 0.6V to 0.7V would be about typical.

On blipping the throttle hard it rises to 0.8V, and then slowly sinks back to the idling pattern, taking a second or two.

Would these figures point to a "tired" sensor? It is still the original sensor (1993) on 320,000 miles. Apart from these readings the car runs well, and returns quite a good miles per gallon (32-36 UK mpg), but it only just passed the recent test - all gases were up at the top of the permitted range.

Many thanks

Cliff Pope

On blipping the throttle hard it increases to about