The code P1646 was easy enough to attain and then just change the item for a new one. But P1646 related to sensor 1 bank 1 in the manifold (pre CAT), which you say has been renewed. P0037 relates to sensor 2 bank 1; that is the same bank of the V6 engine but the one in the CAT (down stream).
Jaguars are good cars, but only if you take care of it. If you never change the oil, or drive like a race car driver, then you will have issues with any car. If you know how to take care of a car, then the X-Type is a good choice. Model year. 2002. Year of manufacture. 2002.
This Jaguar X-Type 2.5 engine oil type is 5W-30 and oil capacity is 5.9 litres. Jaguar X-Type 2001 2.5 V6 has AWD (all wheel drive) (power is automatically distributed between the wheel axles) and manual gearbox with 5 gears. Vehicle has full-time all-wheel drive with 60/40 front-to-rear torque split via viscous-coupling, locking planetary
Get in-depth info on the 2003 Jaguar X-TYPE model year including prices, specs, reviews, pictures, safety and reliability ratings.
Depending on which one you go for, it'll also prove cheaper at the pumps. The average fuel consumption of 48.7mpg on our favourite 2.0-litre diesel is a touch leaner than the equivalent Mercedes . 75 54 49 443 413 243 158 377

jaguar x type 2.5 v6 reliability