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hemicharger69 · 08-29-2013, 06:09 PM

2003 Land Rover SE, 84,000mi.

New Bosch Mass Airflow Sensor, New pre-cat Bosch O2 sensors, K&N air filter, 5W30 synth, engine rebuilt approx. 40K. Looks like new spark plug wires (blue).

OBD-II codes: P1170, P1174

Here's sequence of events:

MAS sensor replaced in May 2013- no check engine light
I bought the car in July 2013 - no check engine light
I replace with K&N air filter July 2013
I replace engine oil Aug 2013
Check engine light comes on Aug 2013 gives me P1170 and P1174
I replace both pre-cat O2 sensors with correct Bosch O2 sensors
Check engine light comes on Aug 2013 gives me P1170 and P1174

I have reset the codes but they keep coming back on. What is the issue?

08-29-2013, 06:09 PM	#1
hemicharger69 Junior Member Join Date: Aug 2013 Posts: 1	Dang Check Engine Light! 2003 Land Rover SE, 84,000mi. New Bosch Mass Airflow Sensor, New pre-cat Bosch O2 sensors, K&N air filter, 5W30 synth, engine rebuilt approx. 40K. Looks like new spark plug wires (blue). OBD-II codes: P1170, P1174 Here's sequence of events: MAS sensor replaced in May 2013- no check engine light I bought the car in July 2013 - no check engine light I replace with K&N air filter July 2013 I replace engine oil Aug 2013 Check engine light comes on Aug 2013 gives me P1170 and P1174 I replace both pre-cat O2 sensors with correct Bosch O2 sensors Check engine light comes on Aug 2013 gives me P1170 and P1174 I have reset the codes but they keep coming back on. What is the issue? Last edited by hemicharger69; 08-29-2013 at 06:29 PM.