Simple 5 second time delay circuit

I'm looking to design a simple time delay circuit for this project.
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It needs to be delayed by about 4-5 seconds before bridging through the diode. This causes the computer to sense a voltage drop in a vehicles O2 sensor.

The current one that is being using is this Automotive Time-Delay Relay

but I am looking for a simpler design possibly just a basic 555 timer?

Any advice would be great! Cheers!

No advice on this one? I just need a simple circuit to delay for 4-5seconds.

Nevermind.

Hi, You can build this very easy and cheap using a pic microcontroller. Your total cost would prob be under $3.00 let me know if you need code help or if you would like one built for you