2011 Peugeot 508 SW 1.6 HDi FAP 112 – Workshop Service & Repair Manual

Expert FAQs: 2011 Peugeot 508 SW 1.6 HDi FAP 112 Manual Diesel RWD Common Problems, Troubleshooting & Maintenance Guide

• Why isn't my 2011 Peugeot 508 SW 1.6 HDi FAP 112 regenerating its DPF properly?

  DPF regeneration issues can be a bit tricky, but often boil down to a few common things. First, make sure you're driving at a consistent speed, like over 40 mph, for about 20-30 minutes so the filter can get hot enough to clean itself. It might also be that your Eolys additive tank is low or empty; this fluid helps the DPF work, so a refill and a system reset with a diagnostic tool could be needed. Sometimes, the DPF pressure sensor itself might be faulty, giving the car incorrect readings. It's always a good idea to get it scanned with a Peugeot-specific diagnostic tool to see exactly what fault codes are showing up.

• What should I do if my 2011 Peugeot 508 SW 1.6 HDi FAP 112 manual gearbox is hard to shift?

  If you're finding it tough to shift gears, particularly with your 2011 Peugeot 508's manual gearbox, several things could be going on. It's often related to the clutch system; perhaps the clutch itself is worn, or there's an issue with the hydraulic master or slave cylinder that's stopping it from fully disengaging. Another common culprit is the gearbox fluid itself—it might be low, old, or even the wrong type, causing extra friction. Checking the fluid level and possibly changing it with the correct specification fluid, like PSA B71 2330, is a great first step. Also, don't forget to check the gear linkages; they can become stiff or misaligned, especially in colder weather.

• How can I help prevent turbocharger failure in my 2011 Peugeot 508 SW 1.6 HDi FAP 112?

  Preventing turbocharger failure in your 1.6 HDi FAP 112 generally comes down to being super diligent with oil maintenance. These engines can be a bit sensitive to oil quality and changes. Always use a high-quality, fully synthetic low-SAPS (ACEA C2 spec) engine oil, like Total Quartz Ineo ECS 5W-30. It’s also wise to shorten your oil change intervals to about every 6 months or 6,000 miles, rather than just relying on the longer manufacturer recommendations. And seriously, address any leaking injector seals right away, as they can contaminate your oil and clog the crucial oil feed to the turbo.

• Why is there water getting into the boot of my 2011 Peugeot 508 SW, and how can I fix it?

  Water in the boot of your 508 SW can be quite frustrating, and it's a known issue for some models. Often, the culprits are the black boot stoppers located on either side of the upper boot, or the rubber seals on the air vents behind the rear bumper. You might also find the main boot lid seal or the seals around the rear light clusters are letting water in. A good approach is to remove the boot lining, then pour water over the suspect areas to pinpoint the leak. Once found, cleaning and resealing with a good quality silicone sealant usually does the trick. Don't forget to completely dry out the boot afterwards to prevent mould.

• My 2011 Peugeot 508 SW 1.6 HDi FAP 112 is showing an AdBlue system fault, what should I check?

  An AdBlue system fault on your 508 SW 1.6 HDi FAP 112, common in diesel models of this generation, can be worrying. Start by checking your AdBlue tank level and top it up with at least 10 litres of good quality fluid if it's low. Sometimes, the warning won't clear with just a small amount. If the level is fine, the issue might be old or crystallised AdBlue, or perhaps a faulty sensor within the system. Using a diagnostic tool to read the specific fault codes is super important here, as it will point you to the exact problem, like a P20E8 code for a faulty AdBlue tank itself, which unfortunately isn't uncommon.