P0155

[grandepau00]

Does anyone know what would cause this code? I had six stored codes and three were p1155 and the other three were o2 heater circuit malf.

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[fastblackmerc]

Does anyone know what would cause this code? I had six stored codes and three were p1155 and the other three were o2 heater circuit malf.

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Are you sure it's P1155? Only one I found is: P1155 Ford - Alternative Fuel Controller which makes no sense for a Marauder.

[grandepau00]

Let me double check, I have them written down.

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[fastblackmerc]

Let me double check, I have them written down.

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Could it be P1115? P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input

[grandepau00]

Sorry, 6 codes: three p0155 o2 sensor heater circuit malf. And three p1151

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[grandepau00]

I cleared the codes last night and drove 25miles. So far the light is still off and no pending codes.

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[RF Overlord]

P0155 and P1151 both refer to the upstream sensor on bank 2...the one closest to the engine on the driver's side. Possibly there was a poor electrical connection at one time. Won't really be able to tell unless it comes back. You might try spraying some electrical contact cleaner and then some WD40 into the connector just for grins.

[grandepau00]

Light came back on today. Im assuming same codes but havent scanned it yet. I dont have the time to mess with the car too much. It mostly just sits in the parking lot and gets driven maybe 50miles/week.

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[vegasmarauder]

That O2 sensor is the one where the wire comes very close to the manifold. In 2 MM's that have had no O2 work the wire was routed over and through a nearby harness to hold the sensor lead further away from the manifold. Worked on a Dodge Magnum (I know) that had an O2 wire touch the pipe and melt. Gave erratic intermittant codes.

Either way, I think its a good bet to change the driver's upper 02 sensor. If you have about 100K plus miles on the car, better to do both upper ones. These control the fuel mix and mileage.

[RF Overlord]

*Edited the thread title for more accuracy during a search.*

[cer0413]

I cleared the codes last night and drove 25miles. So far the light is still off and no pending codes.

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Check your fuses. Had the same issue

[RF Overlord]

That was pretty much a non-answer. You had the same issue and it was a blown fuse? Which one(s)?

[vegasmarauder]

Just had a DTC yesterday at 107K miles. It was P2156 (I think), which is the bank 1, sensor 1 Stuck Lean (Passenger side, upper). Usually an electrical issue with the O2 sensor.

Replaced all 4 O2 sensors becuase it seems at about 100K miles they get sluggish and the performance and gas milaege drop off. Changed them and no code and much better idle and performance.

I wanted to point out that on Bank 2, Sensor 1 (driver's side upper) the wire is feed through a plastic bracket to keep it away from the the manifold. This plastic part will break when you try to get the wire out. I used a good nylon zip tie to hold the wire on the bracket. If you don't keep the wire far enough away from the bracket, it will get too hot. This may be the cause of your DTC code.

The passenger side upper they loop the feed wire back through the engine harness to keep the wire away from the manifold.