Can't find one of the faulty parts

[AgentR`]

Hello mechanics!

Basically I've stucked on one of the story mode order 5th with the red Salem Kieran.
The trouble is I can't find one of the faulty parts. I've done everything including changing oil and removing interior parts...
didn't help... What's that then?
(can't upload screenshots here :v)
and a note, all of these parts you can discover on diagnosing route or test track are okay now...

[Cooldude30nl]

try to look at the filters. and the body parts

[FiveHoeGT]

look for clips A or B

[JBM]

Even on the test path, not ALL faulty parts will be discovered. You might need to remove things like the steering rack to find out if that's faulty, or get under the car and use Examine Mode to inspect all of the visible wheel hub and suspension components. This usually allows me to discover those final pesky hidden parts!

[Danny]

Im having the same issue ive removed the whole suspension and disassembled the engine/trans and nothing... is my game glitched?

[Mardoin69]

It also depends on the Job Order. They have different requirements for how good the parts must be. Sometimes you HAVE to replace parts with 100% condition parts and other times lesser condition parts are ok. Now the problem arises when you replace a bad part with a new one but, a good used part gets put in place of where the bad one was by mistake. Like if you had 3 bad plugs and the rest were ok still, you'd have bought 3 new plugs. But, if you pulled all 8, you'd need to be sure the 3 new go in the exact spot the original bad ones were. Or, else the job order still thinks the plugs weren't replaced with the 100% condition part. Was a big mistake I was making on my earliest job orders.
Side note... no matter what diagnostics you do.... camshafts won't show up in any tests. Have to manually dig into the engine and "inspect" them. Some other parts are like this as well.... piston caps & crankshaft caps for example.

[robjames5]

fuel pump in the fuel tank got me once....

[AC_Black]

run it through the suspension lane then do the engine checks, 90% of all bad parts will show up. If not then do a complete rebuild. Sometimes it is just easier BUT costly lol

[Sam]

It could be engine suspension or transmission

[AgentR`]

It's the mission fifth with salem kieran. It's always the same parts in story line missions