Oil pressure issues?

[Meseburger]

Hello fellow A2 owners,

Last week I had to get a leaky coolant reservoir fixed on my 1.4 petrol, that turned into a slightly nightmarish thermostat housing change as well.

The same day I decided to fix my coolant issues as I was heading home I got the red dripping oil can alarm with 3 beeps repeatedly. It went away after getting the RPM up to about 3500-4000 and holding it there for a while, then it would come back around 2000 again.

I’m fairly certain based on what I’ve read here so far that it means low oil pressure, it only comes up after driving for a while, like 10 minutes of about 10-15 kms.

Also have some reading from a diagnostics tool:

17573 - Long Term Fuel Trim Additive Air Bank 1: Range 1: System too Rich : P1165 - static - No indication on display

17589 - Linear 02 Sensor: Reference Voltage: Open Circuit: P1181 - Intermittent

17604 - Oxygen (Lambda) Sensor Heater Circuit: B1 S1: Electrical Malfunction: P1196 - static - No indication on display

17596 - Linear 02 Sensor: Pump Current: Open Circuit: P1178 - Intermittent

01314 - Engine Control Module - sporadic - Interrogate fault memory

01542 - Yaw Rate Sensor (G202) - sporadic - electr.fault in current circuit

01542 - Yaw Rate Sensor (G202) - sporadic - Implausible signal

00812 - Brake Pressure Release Solenoid (F84) - Intermittent

01271 - Positioning Motor for Temperature Flap (V68) - sporadic - Blocked or without voltage

01336 - Data Bus for Comfort System - sporadic - In one wire operating mode

P0135 - 02 Sensor Heater Circuit Bank 1 Sensor 1

P1178 - Please refer to vehicle service manual!


I am about to change the oil, the oil filter and the fuel filter along with the oil pressure sensor, hoping it will fix the issue, but based on these diagnostic readings do you think anything else might be at play?

Also I’ve had check engine on for over a year now after hitting a bump on the road, but the car works just fine.

Hoping you guys can help me as we have a trip ahead of us next week and I need the car to be able to handle it.

Cheers,
Mark

 

[PlasticMac]

Hello fellow A2 owners,

Last week I had to get a leaky coolant reservoir fixed on my 1.4 petrol, that turned into a slightly nightmarish thermostat housing change as well.

The same day I decided to fix my coolant issues as I was heading home I got the red dripping oil can alarm with 3 beeps repeatedly. It went away after getting the RPM up to about 3500-4000 and holding it there for a while, then it would come back around 2000 again.

I’m fairly certain based on what I’ve read here so far that it means low oil pressure, it only comes up after driving for a while, like 10 minutes of about 10-15 kms.

Also have some reading from a diagnostics tool:

17573 - Long Term Fuel Trim Additive Air Bank 1: Range 1: System too Rich : P1165 - static - No indication on display

17589 - Linear 02 Sensor: Reference Voltage: Open Circuit: P1181 - Intermittent

17604 - Oxygen (Lambda) Sensor Heater Circuit: B1 S1: Electrical Malfunction: P1196 - static - No indication on display

17596 - Linear 02 Sensor: Pump Current: Open Circuit: P1178 - Intermittent

01314 - Engine Control Module - sporadic - Interrogate fault memory

01542 - Yaw Rate Sensor (G202) - sporadic - electr.fault in current circuit

01542 - Yaw Rate Sensor (G202) - sporadic - Implausible signal

00812 - Brake Pressure Release Solenoid (F84) - Intermittent

01271 - Positioning Motor for Temperature Flap (V68) - sporadic - Blocked or without voltage

01336 - Data Bus for Comfort System - sporadic - In one wire operating mode

P0135 - 02 Sensor Heater Circuit Bank 1 Sensor 1

P1178 - Please refer to vehicle service manual!


I am about to change the oil, the oil filter and the fuel filter along with the oil pressure sensor, hoping it will fix the issue, but based on these diagnostic readings do you think anything else might be at play?

Also I’ve had check engine on for over a year now after hitting a bump on the road, but the car works just fine.

Hoping you guys can help me as we have a trip ahead of us next week and I need the car to be able to handle it.

Cheers,
Mark

You need to fix the oil level and pressure, (red oil can), before doing anything else. Don't drive it until it's fixed. Check oil level first.

About the scan, clear all the fault codes, as it's likely most are historic, and not current. Go for a drive and scan again to get a true picture of what is wrong.
Mac.

 

[Meseburger]

You need to fix the oil level and pressure, (red oil can), before doing anything else. Don't drive it until it's fixed. Check oil level first.

About the scan, clear all the fault codes, as it's likely most are historic, and not current. Go for a drive and scan again to get a true picture of what is wrong.
Mac.

Forgot to mention we reset them and only the last 2 faults starting with P came up after rescanning this morning.

Checked the oil level numerous times since I first got the warning, it was fine, topped it up a little it’s now at max.

 

[PlasticMac]

The red oil can is triggered by the oil pressure switch, sensing low pressure, and the oil level sensor sensing low oil level. Red can = both, amber can =, low level only.
Both sensors failing is, I think, unlikely.
The P0135 is the post cat lambda.
Mac.

 

[BigBang]

Does thw oil smell like gasoline? If lambda is not working as it should it can run rich and dilute oil with gasoline. How long drives you usually do?

 

[PlasticMac]

Does thw oil smell like gasoline? If lambda is not working as it should it can run rich and dilute oil with gasoline. How long drives you usually do?

If it's the post cat lambda, it has little effect on the mixture. The pre cat lambda controls mixture.
The post cat monitors the performance of the cat.
Mac.

 

[Meseburger]

Does thw oil smell like gasoline? If lambda is not working as it should it can run rich and dilute oil with gasoline. How long drives you usually do?

25km to work, 25km back home from work.

just changed the oil and the filter, along with both level and pressure sensors, kinda smells like gasoline I guess, though my nose is not to be trusted since covid

 

[PlasticMac]

If it's the post cat lambda, it has little effect on the mixture. The pre cat lambda controls mixture.
The post cat monitors the performance of the cat.
Mac.

Could be the cat itself.
Edit: What were the emmissions like on the last MoT?
Mac.

 

[Meseburger]

Could be the cat itself.
Edit: What were the emmissions like on the last MoT?
Mac.

Not sure how to check the reports from last MoT, things work differently here in Hungary…I’ll ask a colleague tomorrow if I can access reports online.

Made my way back home after changing oil, filter and both sensors, was a 15km drive through the city and no red oil can so far, but I’ll check again on the motorway tomorrow.

Lambda still needs changing I guess, also tried to change to fuel filter, but I couldn’t disconnect the intake for the life of me. It’s stuck there hard…

 

[PlasticMac]

Not sure how to check the reports from last MoT, things work differently here in Hungary…I’ll ask a colleague tomorrow if I can access reports online.

Made my way back home after changing oil, filter and both sensors, was a 15km drive through the city and no red oil can so far, but I’ll check again on the motorway tomorrow.

Lambda still needs changing I guess, also tried to change to fuel filter, but I couldn’t disconnect the intake for the life of me. It’s stuck there hard…

If you had access to the OBD diagnostics, you could check the reading from the lambda before you start the engine, after an overnight. That may indicate if it is a faulty lambda, or the cat. Any chance a friendly garage could check the exhaust emissions for you? If they are OK with engine hot, it's just a faulty post cat lambda.
Mac.

 

[Robin_Cox]

My immediate guess - based on our AUA - would be to have a good look at the oil pressure sensor. Is it leaking oil through it, or is there any damage to the cable? Initially we needed a new sensor, and then later on the loom connection failed - the insulation was all cracked probably as a result of earlier oil seepage and it was simply structurally knackered. A new sensor and a pigtail / connector piece fixed that. As Mac says above, an awful lot of errors on a snapshot scan can be legacy owing to low battery voltage or things that have been repaired some time ago, so worthwhile clearing and checking for what is contemporary.