Question about 1997 Toyota Tacoma

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How do I find out if my ecu is bad. I keep getting an oxygen sensor code and I have replaced the sensor and cleared the code but continue to have the check engine light come back on?

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Make sure the check engine light was cleared after you replaced the o2 sensor....if the codes were not cleared then it will come on forever even if thetre is no problem

Posted on Nov 13, 2009

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My 96 prelude keeps shutting off when hot. What do I do to fix it?


96's are kinda the bad year for our cars being the only obd2 4th gen preludes so for any codes over 43 you have to look it up in the '97-'01 manual. Code 65 is "Secondary Heated Oxygen Sensor Heater Circuit Malfunction (Sensor 2)". Probable causes are an open in the secondary O2 sensor heater circuit or bad ECU. Have you tried resetting the ECU to see if it comes back? If so, you could check for loose wires coming from the secondary O2 sensor in the cat converter going to the 4 pin connector, or if you have access to another ECU I would try to substitute a known good ECU to see if that clears it up. The troubleshooting flowchart is on page 11-79 in the '97-'01 helms manual, and involves checking resistances and for continuity.

I think this could be the code I had on my '96 when I bought it. I tried replacing the secondary O2 sensor, and long story short it was the ECU. Luckily my '96 was still under the extended emmissions warranty, so Honda replaced it for free. I don't think you would be covered under the extended warranty because it was 14 years and under 150k miles. I just barely made it (within a month or 2 and 3k miles) last year.

As far as the engine sounds and rough idle, you could just need a valve adjustment. The secondary O2 sensor just checks the cat to make sure it's working right.

And all auto trans want to move forward when the brake is released.

Aug 02, 2015 | 1996 Honda Prelude

1 Answer

Engine Code P0471 and associated engine performance.


Hi there:
DTC P0471 - Exhaust Pressure Sensor "A" Circuit Range/Performance


Check HERE diagnostic test.

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Aug 17, 2012 | Cars & Trucks

1 Answer

A service on my Toyota Rav 4 2003 shows p1135 a/f sensor heater fault b1-s1 fault with lambda sensor. How does this affect car running is it safe?


OK a bit of background. The oxygen or lambda sensor determines the amount of air in the exhaust gases. It does this by producing a voltage inversely proportional to the amount of oxygen present. When the oxygen is low the voltage is about 1 volt and when the oxygen is high it is less than 0.1 volt. The ECU uses this feed back to continuously adjust the amount of fuel injected for combustion. These sensors only work effectively when they are hot. The manufacturers of sensors include a heater element within the sensor tip to preheat the sensor at start up when the engine is cold. Most modern oxygen sensors have four wires to them, two for the heater (often of the same color) and two for the oxygen sensor circuit. If the heater element fails the sensor is unable to work effectively when starting the engine up. In this case the sensor reports a low voltage which the ECU reads as "high oxygen in the exhaust" or a 'lean' condition and tries to compensate by injecting more fuel. When the engine eventually warms up and the exhaust gases get hot the sensor then begins to function and the ECU will reduce the amount of fuel being injected once more. It is perfectly safe to drive the vehicle. However if you are making lots of short trips in which the engine rarely gets to reach hot running conditions your fuel consumption will suffer badly as the ECU will be injecting way more fuel than you need. You will also find that your exhaust smells of un-burnt fuel and your idle maybe a bit fast and lumpy with the over rich injection cycles. Often a 'bad heater' can be just down to a bad connection due to dirt, or more often corrosion, in the plug/socket to the actual sensor and a few cycles of connecting and disconnecting it can fix it. Replacing a sensor is not catastrophically expensive, $100 or so for the part (Denso or NGK) but that can rise if the garage also fits it.

Jul 05, 2011 | 2003 Toyota RAV4

2 Answers

Hi,i have a 2000 beetle 1.8 turbo,has p1137 error code.Iput new precat 02 sensor,new camshaft pos,sensor and still same code,do you think MAF sensor its bad if i replaced 6 months ago?.,what is my next...


IF you're diagnosing purely off a P-Code of 1137 then you're looking at the following areas.
  • Check Mass Air Flow (MAF) Sensor
  • Check Fuel Pressure Regulator
  • Check Fuel Injector(s)
  • Check Oxygen Sensor Control
    • Check Oxygen Sensor(s)
  • Check Evaporative Emission (EVAP) System

I own a VW and know how hard they can be of you start "chasing a problem". Are you using a VAG.COM cable and software to check your codes? MORE IMPORTANTLY after you changed your parts, does it START? If it's starting/running and you're just trying to get rid of the code, you need to clear it. However, if you're not starting/running then you need to clear it and check for next codes that the ECU is throwing.

Mar 08, 2011 | Volkswagen Beetle Cars & Trucks

2 Answers

97 CV - Chk Eng light on - something about oxygen sensor??? BUT - in cold weather - has little to no PWOWER in accellorating - UNLESS I allow the engine to "warm-up" for a while?>???


if the oxygen sensor is bad it will either not send or send the wrong signal to the ecu making the engine think it is running rich on fuel so the ecu cuts back the fuel supply

Jan 10, 2011 | 1997 Ford Crown Victoria

1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

3 Answers

I'm getting trouble code p1174 on a 2008 chevy uplander and bad mileage


i have an 2007 chevy uplander flexfuel i keep getting p1174 also i have replaced the the o2 sensors and the light keeps coming on
i belive it has something to do with the fuel injection system

Aug 07, 2010 | 2008 Chevrolet Uplander

2 Answers

L/B illuminatted after replaceing the O2 Sensor


Oxygen sensors are comonly blamed when not the cause. Is the code lean or rich mix .What you may have is a fuuel or ignition problem. When was the fuelfilter changed or does it need a tune up?Did you get bad fuel?These things all need to be considered.

Mar 21, 2010 | 2000 Hyundai Elantra

2 Answers

My engine light won't go out even after sensors have been replace


remove brackett from under intake manifold to block you will see a gray or green plug look real close and you will see a bare wire or a wire that has been pinched real bad this wire controls heater circuit for the o2 sensors also check fuse # 15.there is a tsb from honda on this problem

Feb 18, 2009 | 1997 Honda Civic

1 Answer

Knock sensor circuit problem


Well, you have another issue besides a knock sensor problem. A knock sensor code WILL NOT illuminate the check engine light. Check for other codes stored in the ECU. I have seen oxygen sensor issues cause knock sensor issues due to inaccurate fuel delivery resulting in engine ping at all times (causing the ECU to think that the knock sensor is bad because it's reporting ping at all times) - but also had codes for one or more O2 sensors.

Nissan Scope Technician- 10 years with Nissan

Oct 26, 2008 | 2000 Nissan Frontier

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