Check engine light on code P0170
#1
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So, after three years finally decided to take the Disco to more appropriate terrain for it (not much one can do with it in FL besides hauling kids to school). Planned a trip to the Georgia mountains and on our way there today the car’s “Check Engine” light turned on. Read the code and it shows P0170.
This happened a few miles after we stopped on the road for gas. Car has 42,000 miles and even with the light on seems to be working fine (normal idle, normal performance and fuel consumption). Question is whether I should:
- Clear the code and see if it comes back
- Just keep driving it until I am back home and can take it to the dealer (I am a bit OCD so the idea of driving around with a dash light on keeps me awake...)
- Take it to the dealer in Atlanta and see if they can take care of it (would lose at least a day of our trip).
Would appreciate feedback from technically abled folks on this forum.
This happened a few miles after we stopped on the road for gas. Car has 42,000 miles and even with the light on seems to be working fine (normal idle, normal performance and fuel consumption). Question is whether I should:
- Clear the code and see if it comes back
- Just keep driving it until I am back home and can take it to the dealer (I am a bit OCD so the idea of driving around with a dash light on keeps me awake...)
- Take it to the dealer in Atlanta and see if they can take care of it (would lose at least a day of our trip).
Would appreciate feedback from technically abled folks on this forum.
#2
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You are running outside optimal fuel trim. There is a probably an air leak somewhere in your intake system (MAF, vacuum leak, o2 sensor not seated properly...something like that.)
Your engine isn’t using optimal fuel/air so you will see gas mileage go down a little. That’s really all that should happen. In an older car I wouldn’t worry about it. I’ve let those go for tens of thousands of miles on previous vehicles.
But this being a Land Rover, it could explode tomorrow.
Your engine isn’t using optimal fuel/air so you will see gas mileage go down a little. That’s really all that should happen. In an older car I wouldn’t worry about it. I’ve let those go for tens of thousands of miles on previous vehicles.
But this being a Land Rover, it could explode tomorrow.
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Juancl (02-14-2021)
#4
#5
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P0170-
00
Fuel Trim
(Bank 1) - No
sub type
information
Exhaust system leakage
Post catalyst heated oxygen
sensor incorrectly installed
Check exhaust system for
leakage. Rectify as required
NOTE:
Monitor description.
Detects when secondary
fuelling adaptation
control signal is not
plausible
NOTE:
Operational
requirements needed to
allow the monitor to be
fully tested. Drive
vehicle under steady
state conditions for up
to 20 minutes
Pre catalyst heated oxygen
sensor circuit short circuit to
ground, short circuit to power,
open circuit, high resistance
Post catalyst heated oxygen
sensor circuit short circuit to
ground, short circuit to power,
open circuit, high resistance
Pre catalyst heated oxygen
sensor contamination or failure
Post catalyst heated oxygen
sensor contamination or failure
Check post catalyst heated
oxygen sensor is correctly
installed
Refer to the electrical circuit
diagrams and check pre
catalyst heated oxygen sensor
circuit for short circuit to
ground, short circuit to power,
open circuit, high resistance
Inspect connectors for signs of
water ingress, and pins for
damage and/or corrosion
Refer to Electronic Engine
Controls V6 S/C 3.0L - Petrol -
Heated Oxygen Sensors
(HO2S), Diagnosis and
Testing - pinpoint test A
00
Fuel Trim
(Bank 1) - No
sub type
information
Exhaust system leakage
Post catalyst heated oxygen
sensor incorrectly installed
Check exhaust system for
leakage. Rectify as required
NOTE:
Monitor description.
Detects when secondary
fuelling adaptation
control signal is not
plausible
NOTE:
Operational
requirements needed to
allow the monitor to be
fully tested. Drive
vehicle under steady
state conditions for up
to 20 minutes
Pre catalyst heated oxygen
sensor circuit short circuit to
ground, short circuit to power,
open circuit, high resistance
Post catalyst heated oxygen
sensor circuit short circuit to
ground, short circuit to power,
open circuit, high resistance
Pre catalyst heated oxygen
sensor contamination or failure
Post catalyst heated oxygen
sensor contamination or failure
Check post catalyst heated
oxygen sensor is correctly
installed
Refer to the electrical circuit
diagrams and check pre
catalyst heated oxygen sensor
circuit for short circuit to
ground, short circuit to power,
open circuit, high resistance
Inspect connectors for signs of
water ingress, and pins for
damage and/or corrosion
Refer to Electronic Engine
Controls V6 S/C 3.0L - Petrol -
Heated Oxygen Sensors
(HO2S), Diagnosis and
Testing - pinpoint test A
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canon_mutant (02-15-2021)
#6
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Before I bought my D5 I did look into this engine in other older vehicles to get an idea of common problems and the only two I found:
1. Some piece in the supercharger that cracks (for which there is an aftermarket strengthened replacement but JLR dealers just just replace the whole supercharger)
2. The oxygen sensors in the exhaust.
So the refuel could have been coincidence and an o2 sensor may have actually died.
I’m sure there are other issues but those two were the most common re this engine which gave me some comfort in buying it.
1. Some piece in the supercharger that cracks (for which there is an aftermarket strengthened replacement but JLR dealers just just replace the whole supercharger)
2. The oxygen sensors in the exhaust.
So the refuel could have been coincidence and an o2 sensor may have actually died.
I’m sure there are other issues but those two were the most common re this engine which gave me some comfort in buying it.
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