I recently changed my spark plugs (to Bosch platinum plus 4s), my wires, (to Magnacore 8mm), oil filter (K&N), oil, and all four oxygen sensors. Now my engine revs irregularly and the scanner is spitting out the following three codes: P1551, 1514, and 1884. Does any body have any idea why I'm getting these codes? Is there something I can do to correct th problem or do I need to go to the stealership? Ideas please and thanks in advance.

 

I just had a scan on my 01 LR Discovery. Not sure what you are driving. 1514 and 1551 are linked and are reportedly "replace idle air control (IAC) valve. I went to O'Reily auot and had a free scan, that is what their computer suggested to help with those codes. Not sure about the other. And, I am a newb so extra guidance is recommended

 

I drive a 99 D-II. I am new on this site as well. Someone told me the the same thing that I need an OSCAR valve and I've already ordered one. Thanks.

 

Here is a page from the Bosch manual for Rover ECUs, which has both the codes. They are related to wiring/connector issues with the IACV (idle air control valve), or the unit shorting out internally. Once resolved, the 1884 code should go away, the tranny computer and engine comper are always talking on the data buss about how much power has been requested by her majesty and what gear to select to move swiftly along the cobblestones. What is an OSCAR valve?

 

What's an OSCAR valve? I never heard of that. I checked out the codes Savannah Buzz sent. I already ordered the IACV. It should be getting here today or tomorrow.

 

re: I need an OSCAR valve and I've already ordered one

re: What's an OSCAR valve? I never heard of that

I'm still looking for the flux capacitor..... here's the shop manual page on the IACV, you may need new clamps as well.

 

Oscar was a typo folks? Meant IACV. Unfortunately, I was replying using an iPad and obviously IACV is a word it never came across. So IACV was substituted for OSCAR. Lesson folks, always spell check. Sorry for that loopy posting. Savannah Buzz thanks for the heads up about also needing clamps.

 

I put in a new IACV valve. I'm still getting the same codes (P1551, P1514, and P1884). I erased them post installing the new IACV valve but they came back when I re-scanned. Even worse, I'm now also having a P1590 (oxygen sensor) code, even though I changed all four oxygen sensors about seven months ago with new ones --do they go out so quickly? I am now also having a P0102 code. Help!!

On the bright side, the car seems to be idling better than before I changed the IACV valve.

 

By the way, I also want to mention that I changed the MAF as well. The scan is also showing the following on monitoring or MIL (I don't quite remember which one at the moment): "Evap" and "catalyst". The MAF I changed about two weeks ago. The IACV valve I only changed yesterday. Could it be that the codes are till coming on because I only erased them today and drove for about five miles; that I need to drive a lot more miles for the vehicle to reset itself?

 

P1514 IACV opening coil malfunction Open circuit - opening winding

P1551 IACV closing coil malfunction Open circuit - closing winding

IMHO you need to check the connectors for the unit, shale the harness, etc., and reset codes again. There are two windings, one closes the valve, one opens it. They can't be open all the time or you truck would idle poorly.