TATA Motors Indigo Owner's Manual & Service Book - page 117
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MAINTENANCE & CAR CARE - EGR System
EGR System : ( Common Rail engine)- if fitted
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.
NOTICE
Use diesel fuel of recommended specifications. Use of any other
diesel fuel can increase the pollutants.
WARNING
Avoid breathing exhaust gases. This contain carbon monoxide
which is harmful.
1. EGR Valve
2. EGR Cooler
3. EGR Tube
4. Electronic Vacuum
Regulator (EVRV)