TATA Motors Indigo eCS Owner's Manual & Service Book page 120

MAINTENANCE & CAR CARE
EGR System : ( CR- 4)
To reduce exhaust pollution from your car, the engine is provided with
exhaust gas recirculation (EGR) system.
The EGR system consists of an EGR valve, EGR cooler and EGR
pipe. The contineously variable EGR valve is controlled by ECU. A
controlled amount of exhaust gas is mixed with intake air, in part load
and part throttle conditions. This helps in reducing harmful emissions.
In addition to EGR System your car is also fitted with diesel oxydation
catalytic convertor to reduce exhaust pollution.
Use diesel fuel of recommended specifications. Use of any other
diesel fuel can increase the pollutants.
Avoid breathing exhaust gases. This contain carbon monoxide
which is harmful.
118
NOTICE
WARNING
EGR SYSTEM (IF FITTED)
1. EGR Valve 2. EGR Cooler 3. EGR Tube
4. Electronic Vacuum Regulator (EVRV)