Quote:
Originally Posted by tomaszjanczak
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- Exhaust leak near O2 sensor
- Faulty O2 sensor
did this occurr after fitting ofh ?
did you use new gaskets
did 02 sensors screw in by hand ? then torque to correct level. if you forced them then it can strip threads or damage sensor
Tips for changing header
1. Always use new gaskets, if you re-use the old ones it will leak causing 02 sensors to read incorrectly
2. Run a thread tap or chaser (M18 x 1.5) through you new header 02 bungs to clean them up , 02 sensors should screw in by hand. If you force them they are easily damaged and the threads on 02 sensor easily stripped.
3. Put high temp anti-seize on header bolts and 02 sensor bung threads, DO NOT get any grease or anti-seize on sensor tips, once contaminated they are stuffed.
4. Leave the 02 sensors in the stock header until you remove it from car then remove sensors. Just disconnect the plugs an tethers on wires as per picture below.
5. Black plug to black socket, grey plug to grey socket. and remember to plug both back in.
6. Use correct torque for bolts and o2 sensors, re-torque after a heat cycle.