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      08-07-2018, 11:51 AM   #1
HTM101
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Several OBD Codes

The SES light popped on a week ago. This is a stock 3.0 Si with 66,000 miles.

Using Torque Pro with the profile set for my car and engine, 2 codes found:
P114B - Powertrain, missfire during start cyl. 3
P2270 - Powertrain, O2 sensor signal stuck lean bank1 Sensor2

I pulled out the MAF sensor and cleaned it, although it appeared to be clean before I worked on it.

What/where would you guys suggest I look?

Thank you,
David
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      08-08-2018, 02:58 PM   #2
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Not Z4 specific, but O2 sensor connections can become corroded/dirty causing codes to be triggered. I'd try cleaning both (don't know which is #2), clear codes, then see what's what. Could be that simple.
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      08-08-2018, 04:36 PM   #3
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Today I pulled the four O2 sensor connections apart and cleaned them with fluid. I pulled spark plug #3 & #2 and compared them. They were identical which told me there's nothing overly lean in cylinder #3.

I decided to check the intake components for fit and vacuum leak/s. All were good except the rear of the breather box, or whatever its called, and the junction box that connects with it. That one connection didn't look snug. I couldn't push them together for a tighter fit while still mounted to the engine, so I tried snugging the clamp band and the parts separated more. I removed the breather box and junction box. With both pieces lying on my lap I could snap them together and then tighten the clamp band. The new connection was much tighter than what I initially found.



After reassembly, I deleted the codes and went for a 20 mile drive. So far no codes, but it may be premature. After I log another 100 miles without a code, I'll be able to say the stars were aligned for me today.

David
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Last edited by HTM101; 08-08-2018 at 04:41 PM..
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      08-08-2018, 04:46 PM   #4
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^ Nice. Gotta think you're going to be good.
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