I have a 93 740l. It runs great on the freeway. It's problem is when l get on the off ramp. Sometimes it goes into limp mode. While in this mode l put it on a diagnostic code reader at a friend's shop. The codes were 105, 155. Since it's intermittent could it be loose wiring loose plug etc. I understand that  code 105 is a speed sensor. But l havery no clue about 155. 

Thanks!

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Profile picture for user EuroTech

These codes are usually due to the mechanics. It could either be defective or as you mentioned a connection issue.

Check the plug that connects to the transmission for oil leaks.

check the transmission fluid level as well.

Report back if problem persists.

Profile picture for user Pen teller

A fault code PO155 means '' 02 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) ''

 

This simply means that the heating element of the oxygen sensor takes a long time to heat, longer than normal.

 

The causes can include:

 

1. A faulty power module (PCM)

2. Engine Coolant sensor not working properly

3. A broken wire or a bad circuit

4. The oxygen sensor not working

 

You can take a look at these issues.

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