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E36/7 Z3 (1996-2002)
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Old 03-23-2017, 08:09 AM
mksp4747 mksp4747 is offline
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Location: Charlotte, NC
Join Date: Sep 2013
Posts: 5
Mein Auto: 1999 Z3
Scanned error codes - 1999 Z3 2.8

Hi al!
My Z is due for inspection and the dreaded check engine light is on. Ran the scanner and it comes up with 5 codes.

First two are codes 25 and 55, Lambda Sensor Heater -Bank 1 - O2 sensor and Lambda Sensor Heater -Bank 2 O2 Sensor.
I recently replaced both pre-cat O2 sensors and while it cleared the original fault, it now comes up with these two.
Also, when I looked at the sensor cables, the feed cable going to bank 2 sensor was not fed correctly and laid up against the engine and melted some of the wire insulation, down to bare wire....#1 was fine. Replaced both sensors...probably needed it with 177K miles and I have no idea if they were ever replaced.
Not I get these sensor heater errors. Ideas?

The other 3 look like they may be related, they come up in order, 50, 35 and 126:
50: EVAP Control Valve or Response Monitoring Level 2
35: Aux. Air Injection System Relay
126: Activation Tank Leak Pump Solenoid

Any thoughts on these error codes? is one causing the others or?

Reset codes after O2 sensors replaced pre-cat.
Also, repaired the cable running to bank #2 sensor.
The code errors came in after the above was done. Drove it several times and re-read codes. Cleared and read again, The error codes I listed above were read after all of this.

Last edited by mksp4747; 03-23-2017 at 08:39 AM.
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