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C30 T5 'Reduced Engine Performance'

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Old Jan 19th, 2018, 00:23   #11
T5R92011
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As mentioned it's either gonna be MAF sensor, Turbo Control Valve or Fuel Pressure sensor.

All of which are easy simple things to change (though you would use MAF sensor cleaning spray, rather than outright changing it)
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Old Jan 20th, 2018, 14:08   #12
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Just heard from Nervous Nelly after her trip to see this Volvo specialist. After reading the fault codes (sorry - don't know what he was using) he has confidently declared the problem to be....

The accelerator pedal; which I take to mean the throttle pedal potentiometer.

The guy said he'll go away and come back with a price for the part and advised not to drive the car on any long journeys until it is fixed.

I've enough experience to know that changing the part won't necessarily fix the problem but it's probably worth a shot. When I did the same job on my Range Rover the part was about £100 and took 10 minutes.

For anyone based in West London note that this Volvo chap works out of the same premises as 'The Jag Workshop' in Ealing that looks to be a very interesting place as their website shows:
http://thejagworkshop.co.uk/
loads of E-types and other classic Jaguars. It was friend with an XJS who recommended giving them a call.

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Old Jan 23rd, 2018, 10:50   #13
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Wasn't the Throttle Position Sensor a recall with Volvo?
Known to cause the reduced engine performance issue
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Old Jan 24th, 2018, 13:28   #14
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Quote:
Originally Posted by Kizzer View Post
Wasn't the Throttle Position Sensor a recall with Volvo?
Known to cause the reduced engine performance issue
Thanks but I don't see it in the list of recalls on the VOSA site linked to on the top of this forum.

I did find this thread though suggesting problems with the accelerator pedal and limp mode are more likely to be caused by damp/corroded connections at the pedal plug or the CEM plugs:
https://www.volvoforums.org.uk/showthread.php?t=195217

Heard back from Volvo specialist today that new pedal is £148 in VAT and £75 to fit so advised my sister to go ahead and have it fitted but ask the guy to check the condition of the connections at the same time (sure he won't - though!). I would do the job for her but unfortunately that's not possible to arrange at the moment given the distance.

I await developments......
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Old Jan 28th, 2018, 20:55   #15
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New accelerator pedal assembly duly fitted last Friday and the car completed a round trip from West London to Oxford and back with no reoccurrence of 'limp mode' . Perhaps it is fixed. I hope so but given the nature of these electrical issues I'd like to see a few hundred more motorway miles to be confident. Nervous Nelly is so far much relieved.
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Old Nov 15th, 2019, 09:49   #16
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Default MAF and Fuel Pressure Sensor were faulty

I have Volvo V50 T5 model year -05 (automatic) and mileage was back then when I bought the vehicle around 90000 / 146 000 km. Vehicle was in good condition but after one month ago I got "Reduced Engine Performance" message to my dashboard. I used OBD-reader and it gave error code P0101 which is Mass air flow sensor error. I read some forums that It could be only dirty airfilter so I bought new one. Then I released the error code, because vehicle seems to have power issues when code was on and fuel economy went bad.

It took about 6-7 months until I got same "Reduced Engine Performance" message to dashboard. OBD gave same error code. This time I bought entirely whole MAF-sensor unit around 70-80 euros and It was easy fix. Then I reseted the code.

Now It took around one month and again same "Reduced Engine Performance" came to dashboard. Now OBD didn't gave any error codes. Then I was searching online some clues and I bought new fuel pressure sensor around 40 euros. Swap was pretty easy and now after around 930 miles / 1500km Volvo is doing fine without messages in dashboard.

In summary "Reduced Engine Performance" can mean many diffrent things. I think I had two diffrent problems going on. One was the MAF and the other was fuel pressure sensor and only MAF gave error code to the OBD reader but still those gave same dashboard message. I hope this will help someone
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Old Nov 16th, 2019, 10:32   #17
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Hello.

My V50 2006 had this. The problem in the end was a faulty / worn out accelerator pedal sensor. The accelerator pedal needed replacement.
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