Error codes feedback?
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AudiWorld Junior Member
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Error codes feedback?
P0431 Catalyst efficiency code
P0442 Small evap leak
P0491 Secondary air flow problem bank
P0492 Secondary air flow problem bank
Are these all SAI related or what are some thoughts on what these 4 would likely entail to have corrected? Thanks, all!
P0442 Small evap leak
P0491 Secondary air flow problem bank
P0492 Secondary air flow problem bank
Are these all SAI related or what are some thoughts on what these 4 would likely entail to have corrected? Thanks, all!
AudiWorld Senior Member
Joined: Jan 2015
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From: Sierra Vista, AZ
Probably all related. Secondary air leak could be the air pump, a vacuum line(s), bad fuel filler cap, and numerous other smog type components. Start by looking for cracked, leaking or otherwise compromised vacuum lines.
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Thanks, Harleyguy. Yeah, I read a DIY on the forums of replacing the SAI pump only to find out it simply needed a new bearing (i think it was) and has had no issues since. So, am hoping that is the case here, but didn't know if anyone was super savvy on these codes to see that it is indicating anything else specifically or not. Thanks for the input!
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Hello guys, I m new here, so sorry for my bad englsh 
I got my audi a6 with 2.7bt engine. Yesterday we replaced old egt sensor schemes with the new ones from sidmotorsports.pl. The egt fault code disapeared and know I got 8 fault codes left. From what I should start? one of my friends is suggesting to check whole vaccum system, but maybe its something else? I'm adding the fault codes:
8 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - Intermittent
16687 - Cylinder 3
P0303 - 35-10 - Misfire Detected - Intermittent
16518 - Oxygen (Lambda) Sensor B1 S1
P0134 - 35-00 - No Activity
16542 - Oxygen (Lambda) Sensor B2 S2
P0158 - 35-00 - Signal too High
17763 - Cylinder 1 Ignition Circuit
P1355 - 35-10 - Open Circuit - Intermittent
17772 - Cylinder 4 Ignition Circuit
P1364 - 35-10 - Open Circuit - Intermittent
16685 - Cylinder 1
P0301 - 35-10 - Misfire Detected - Intermittent
16686 - Cylinder 2
P0302 - 35-10 - Misfire Detected - Intermittent
Readiness: 0110 1101
I got my audi a6 with 2.7bt engine. Yesterday we replaced old egt sensor schemes with the new ones from sidmotorsports.pl. The egt fault code disapeared and know I got 8 fault codes left. From what I should start? one of my friends is suggesting to check whole vaccum system, but maybe its something else? I'm adding the fault codes:8 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - Intermittent
16687 - Cylinder 3
P0303 - 35-10 - Misfire Detected - Intermittent
16518 - Oxygen (Lambda) Sensor B1 S1
P0134 - 35-00 - No Activity
16542 - Oxygen (Lambda) Sensor B2 S2
P0158 - 35-00 - Signal too High
17763 - Cylinder 1 Ignition Circuit
P1355 - 35-10 - Open Circuit - Intermittent
17772 - Cylinder 4 Ignition Circuit
P1364 - 35-10 - Open Circuit - Intermittent
16685 - Cylinder 1
P0301 - 35-10 - Misfire Detected - Intermittent
16686 - Cylinder 2
P0302 - 35-10 - Misfire Detected - Intermittent
Readiness: 0110 1101
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Hello guys, I m new here, so sorry for my bad englsh I got my audi a6 with 2.7bt engine. Yesterday we replaced old egt sensor schemes with the new ones from sidmotorsports.pl. The egt fault code disapeared and know I got 8 fault codes left. From what I should start? one of my friends is suggesting to check whole vaccum system, but maybe its something else? I'm adding the fault codes:
8 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - Intermittent
16687 - Cylinder 3
P0303 - 35-10 - Misfire Detected - Intermittent
16518 - Oxygen (Lambda) Sensor B1 S1
P0134 - 35-00 - No Activity
16542 - Oxygen (Lambda) Sensor B2 S2
P0158 - 35-00 - Signal too High
17763 - Cylinder 1 Ignition Circuit
P1355 - 35-10 - Open Circuit - Intermittent
17772 - Cylinder 4 Ignition Circuit
P1364 - 35-10 - Open Circuit - Intermittent
16685 - Cylinder 1
P0301 - 35-10 - Misfire Detected - Intermittent
16686 - Cylinder 2
P0302 - 35-10 - Misfire Detected - Intermittent
Readiness: 0110 1101
I got my audi a6 with 2.7bt engine. Yesterday we replaced old egt sensor schemes with the new ones from sidmotorsports.pl. The egt fault code disapeared and know I got 8 fault codes left. From what I should start? one of my friends is suggesting to check whole vaccum system, but maybe its something else? I'm adding the fault codes:8 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - Intermittent
16687 - Cylinder 3
P0303 - 35-10 - Misfire Detected - Intermittent
16518 - Oxygen (Lambda) Sensor B1 S1
P0134 - 35-00 - No Activity
16542 - Oxygen (Lambda) Sensor B2 S2
P0158 - 35-00 - Signal too High
17763 - Cylinder 1 Ignition Circuit
P1355 - 35-10 - Open Circuit - Intermittent
17772 - Cylinder 4 Ignition Circuit
P1364 - 35-10 - Open Circuit - Intermittent
16685 - Cylinder 1
P0301 - 35-10 - Misfire Detected - Intermittent
16686 - Cylinder 2
P0302 - 35-10 - Misfire Detected - Intermittent
Readiness: 0110 1101
Cylinder one bad coil?
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