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No Turbo

Paul Richardson

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I’ve recently purchased privately a 2013 petrol RCZ with very low mileage. Took it for its first long run, about an hour, I needed fuel , put standard unleaded petrol in it, parked it up for 4 hours, then headed home, very quickly the turbo cut out. Took it to my garage the next morning, the fault codes were as follows,

1186H/4486 - undocumented code
P2191 - Richness Adjustment: Mixture Too Lean

After some discussion we agreed it may be that the fuel was low and I put in unleaded and maybe the previous owner ran it on super unleaded. Filled up with super unleaded and that seemed to do the trick for 5 days, until today, when the turbo cut out again. Garage removed fault codes and turbo back up and working, but for how long?

Does anyone know what the problem can be, why is there an undocumented code there?

All help would be appreciated.
 

Pedro

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Too much Air in the Fuel/Air ratio ? Faulty Lambda sensor ( Bank 1) maybe upstream sensor has detected lean combustion... Faulty Maf sensor ( clean sensor) Faulty Powertrain Module ( Rarely) Electrical circuit Malfunction
Undocumented codes are probable ECU Programed stored codes not usually shown up as a system fault ?
 

Paul Richardson

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Ok, next instalment. Took it to an independent Peugeot specialist garage, they hooked it up to their diagnostics, a different code to P2191, but similar ‘ lean mixture’. They took it for two test drives and couldn’t get there the turbo to cut out. So, very frustrating, as I’m no further forward. Their theory is that it only does it if you push the car before it’s up to temperature. Drove it home, hot day, hot engine, no problem. Does that help anyone coming up with any further help or advice?
 

Pedro

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I know these Engines need a full normal warm up if you thrash them from cold before normal temp is reached they don't like it & this can trigger Fault codes for Engine Temp Fan Water Pump etc which can affect they Combustion data cycle being sent to the ECU & will affect functionality or performance
 

Paul Richardson

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I had a previous RCZ and it never had this problem. There’s obviously a fault/ intermittent fault somewhere, a sensor or some component is playing up. It could be a dozen or more things I guess. Cars used to be so simple......
 

Grimreaper

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If fuel pump is starting to fail will also poss cause lean mixture,when pump pressure starts dropping. Need to do a monitoring test with running on OBD socket to see if fuel pressure is the fault.
 

Paul Richardson

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The fuel pump was changed earlier this year by previous owner. I didn't note the code this time round, previous code was P2191, both showed mixture too lean.
 

Pedro

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The code showing a Air/fuel ratio fault Bank 1 is normally P0172 plus you could easily find at least 8 corresponding codes relating to that fault :confused:
 

Paul Richardson

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Hi Pedro, thanks for all your help. Not very technically minded, so excuse my ignorance. All I know, is that both garages said the code(s) were related to 'mixture too lean'. The first garage was my local and the second a specialist independent Peugeot garage. The second garage had different diagnostic kit ( Peugeot approved?), different codes but relating to the same diagnosis. Would the second garage have saved the codes on their kit, perhaps I should ring them again?
 

Pedro

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As Grimreaper pointed out it may be fuel pressure related & you could do with having an onboard monitoring data readout with the scanner plugged in whilst your driving from a cold start which leads me to ask is the Cold start up working normally & do you wait for it to shut off before driving the reason I ask is that modern cars have a Atmospheric Temp sensor usually in the door mirror which sends data to the ECU so it knows the outside Temp & adjusts the starting cycle to suit the Air temp on mine if its a warm day the cold start only lasts for maybe a minute before it drops the revs to normal but on colder days it can take longer & I wonder if there is a issue lurking somewhere ?
 

Paul Richardson

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Next installment. It's been ok for 4 days, been careful to warm up engine before taking it over 2000rpm. But today, did the same and the turbo cut out whilst driving sedately and engine up to temperature. Difference today is, ambient temp 8 degrees and heavy/standing rain. ☹
 

RCZIain

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So the turbo gives no boost, or it's going in to limp mode?
Also P2191, if read with the correct PSA equipment and not some Mickey Mouse £1.75 ebay reader is an engine timing fault code.

Which given it's a THP is more than likely.
 

Pedro

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Blockage in the Turbo wastegate is another culprit to cause that fault did you manage to check the Turbo boost control solenoid valve?
 

Paul Richardson

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Not limp mode, just no boost. My garage used a decent diagnostic piece of kit (Snap- On) from what I could see, definitely not a cheap imitation. P2191 stated Richness Adjustment : Mixture Too Lean.

Pedro - haven't checked the Turbo boost control solenoid valve, so will ring the second garage ( Peugeot independent) tomorrow and see what they say, also get them to read back to me ( if they still have the fault codes stored), what came up on their diagnostic kit.
 

Paul Richardson

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So the turbo has cut out three times over the last couple of weeks, but only today on way home did I get the engine management light on! A few hours after the third time of no boost.
 

Pedro

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That means the ECU is logging the Fault which is a good thing in hindsight as it shows or could possibly point to where the fault in the system maybe coming from but with a Turbo issue as I pointed out you can sift through at least 8 codes before you hit the right one its all down to elimination
 
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