this jeep is driving us nuts . we've tried everything that we can think of still high nox [...] numbers are 15 mph-rpm 2485 co2-15.1% o2 0.0% hc-9ppm co 0.01% nox-663ppm. 25mph-rpm 2491 c02-15.1% 02-0.0% hc-6ppm co-0.00% nox-1292ppm now a little back ground on... Login to read more.