I'm getting P0400 and P0235 on Renault Logan

There is a sensor on some function that has intermittent fault. Hard to find without a thorough investigation. Sometimes it is simple as a loose gas cap or one with a damaged gasket. Sometimes it is an oxygen sensor on intake manifold. No way to tell without an analysis machine and repair manual.
Been through this myself with a 2005 Nissan Pathfinder--must be gas cap or tank or some leak sensor somewhere.

Go into a Renault parts dealership and they can pull it up on their computer.

1. Diagnosis: The first step in repairing the steering system is to diagnose the problem. This may involve a visual inspection of the steering components, a road test to check for handling issues, or the use of diagnostic tools to identify any faults in the steering system.
2. Replacement of worn or damaged components: If any components of the steering system are worn or damaged, they will need to be replaced. This may include parts such as the steering rack, tie rods, ball joints, or steering column.
3. Alignment: After replacing any worn or damaged components, it's important to perform a wheel alignment to ensure the steering system is properly calibrated. This will help to prevent any uneven tire wear or handling issues.

please tell me about repair mahindra logan staring pump

MI SIMPLU ,DEZMEMBR?RT !

you are correct ,try 12th inlet and 14 exhaust

p0400 is dead EGR.
and can fail 2 ways, stuck open or closed
if open engine wants to stall and lots of other DTC errors caused by EGR,
stuck closed, engine wants to PING
I'd fix EGR first, and not go broke finding shirt tail failures.
take it to shop let them fix it.
some times just cleaning the egr is all that is needed.
the other 2 codes are AFR lean codes
and if EGR bad or worse after 20 years, they EGR cracks and sucks air and engine goes lean.
I'd expect more things wrong and more DTC on any car this old.
for sure driven ******* the Autobahn.