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Join Date: Apr 2017
Location: Anderson, SC
Posts: 4
Repeat Oxygen Sensor Code

I need help. My 2003 Boxster S just threw a repeat fault code 16 - oxygen sensor ageing delay bank 1. The engine gave me this code so I researched and replaced all four O2 sensors with the Bosch units from this web site. (Why pay for the Porsche label when it's the same part). I cleared the code and it came back. I checked and cleaned connections, cleared the code, and it eventually came back.

My durametric tool gave the following information at idle:
O2 sensing Bank 1:
volts ahead: .1-.75
volts behind: .07-.12
Mean 1-0.99
O2 sensing Bank 2:
volts ahead: 0.93-0.99
volts behind: 0.7-0.75
Mean: 1.0

The engine has a complete Fabsport performance package installed by the previous owner which includes the Fabsport exhaust system and new cats (200 cell HJS Sport Catalytic Converters.) The engine also has a 74 mm throttle body/IPD Plenum and V-Flow air intake. It run GOOD. The car has 52K miles.

How do I verify all the O2 sensors are working correctly?
Could this be wiring?
Could this be vacuum?
Old 09-04-2018, 09:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
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Join Date: Nov 2008
Location: Sanford NC
Posts: 1,266
Only suggestion I can offer is to look at the first couple of paragraphs here. They discuss how the O2 sensors work and are used as well as the values between which they should oscillate. If I read the values you posted and Brett's write-up correctly, the problem is with bank 2 and not bank 1 because the pre-cat sensor is not oscillating in a wide enough range (pre should be .2 to .8 and post should be much lower) showing the mix is thus rich.

I assume you used the same Bosch part numbers as came out of the car.

I'd swap both sensors from one bank to the other and see if the code and values follow.

If you look at the possible codes at the bottom of the write-up, a total sensor short or fail yield very specific codes and not an aging code which is saying the sensor is not reacting fast enough. So I'm not thinking wiring.

Sorry I can't help with specific experience.

Last edited by mikefocke; 09-04-2018 at 04:50 PM..
Old 09-04-2018, 04:48 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
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Join Date: Apr 2017
Location: Anderson, SC
Posts: 4
Thanks. I will give that a try. Yes I got the correct Bosch sensors (at least the one sold by Pelican.) I even made sure to ask which Bosch part number went where.
Norm
Old 09-07-2018, 09:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
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